EXHIBIT 3.1
                Certificate of Incorporation of NBT Bancorp Inc.,
                      as amended through February 17, 2000





                          CERTIFICATE OF INCORPORATION
                                       OF
                                NBT BANCORP INC.
                               AS AMENDED THROUGH
                                FEBRUARY 17, 2000

         FIRST:   The name of the corporation (hereinafter called the
Corporation) is NBT BANCORP INC.

         SECOND:  The address of the registered office of the Corporation in the
State of Delaware is 229 South State Street,  City of Dover, County of Kent; and
the name of the registered  agent of the Corporation in the State of Delaware at
such address is The Prentice-Hall Corporation System, Inc.

         THIRD:  The nature of the business and the purpose to be conducted  and
promoted by the Corporation shall be to conduct any lawful business,  to promote
any  lawful  purpose,  and to engage in any  lawful  act or  activity  for which
corporations may be organized under the General  Corporation Law of the State of
Delaware.

(A) FOURTH: The total number of shares of all classes of capital stock which the
Corporation shall have the authority to issue is Thirty-Two Million Five Hundred
Thousand  (32,500,000) shares,  consisting of Thirty Million (30,000,000) shares
of Common Stock,  par value $.01 per share and Two Million Five Hundred Thousand
(2,500,000) shares of Preferred Stock, par value $.01 per share.

         Each share of Common Stock having no par value,  stated value $1.00 per
share  (`Existing  Common  Stock')  outstanding  on the  effective  date  of the
amendment including this paragraph shall be reclassified as and changed into one
share of Common Stock,  par value $.01 per share ("New Common Stock"),  upon the
effectiveness   of  such  amendment.   The   certificates   that  prior  to  the
effectiveness of such amendment  represented  Existing Common Stock shall remain
outstanding and shall  thereafter  represent the shares of New Common Stock into
which the Shares of Existing  Common  Stock have been  reclassified  as provided
herein.

         FIFTH:  The Board of Directors is  authorized,  subject to  limitations
prescribed by law and the provisions of the Article  FOURTH,  to provide for the
issuance of the shares of Preferred Stock in series, and by filing a certificate
pursuant to the applicable law of the State of Delaware,  to establish from time
to time the number of shares to be included in each such series,  and to fix the
designation,  powers,  preferences  and rights of the shares of each such series
and the qualifications, limitations or restrictions thereof.

         The  authority of the Board with respect to each series shall  include,
but not to be limited to, determination of the following:

                  (a) The number of shares constituting that series and the
distinctive designation of that series;




                  (b) The dividend  rate on the shares of that  series,  whether
dividends  shall be  cumulative,  and, if so, from which date or dates,  and the
relative  rights of  priority,  if any, of payment of  dividends  shares of that
series;

                  (c) Whether that series shall have voting rights,  in addition
to the voting  rights  provided  by law,  and,  if so, the terms of such  voting
rights;

(A) AS LAST AMENDED FEBRUARY 17, 2000

                  (d) Whether that series shall have conversion privileges, and,
if so, the terms and  conditions of such  conversion,  including  provisions for
adjustment of the conversion rate in such events as the Board of Directors shall
determine;

                  (e)  Whether  or not  the  shares  of  that  series  shall  be
redeemable,  and, if so, the terms and conditions of such redemption,  including
the date or dates upon or after which they shall be  redeemable,  and the amount
per share payable in case of redemption,  which amount may vary under  different
conditions and at different redemption dates;

                  (f)  Whether  that  series  shall have a sinking  fund for the
redemption  or  purchase  of shares of that  series,  and,  if so, the terms and
amount of such sinking fund;

                  (g) The  right of the  shares  of that  series in the event of
voluntary  or  involuntary  liquidation,   dissolution  or  winding  up  of  the
Corporation,  and the relative rights of priority,  if any, of payment of shares
of that series;

                  (h) Any other relative rights, preferences and limitations of
that series.

         Dividends on  outstanding  shares of  Preferred  Stock shall be paid or
declared  and set apart  for  payment,  before  any  dividends  shall be paid or
declared  and set apart for payment on the Common Stock with respect to the same
dividend period.

         If upon  any  voluntary  or  involuntary  liquidation,  dissolution  or
winding up of the Corporation,  the assets available for distribution to holders
of shares of  Preferred  Stock of all series shall be  insufficient  to pay such
holders  the full  preferential  amount to which  they are  entitled,  then such
assets shall be distributed  ratably among the shares of all series of Preferred
Stock in accordance with the respective  preferential  amounts (including unpaid
cumulative dividends, if any) payable with respect thereto.

         SIXTH:   The Corporation is to have perpetual existence.

         SEVENTH: The name and the mailing address of the incorporator are as
follows:



         NAME                                        MAILING ADDRESS

         Everett A. Gilmour                          52 South Broad Street
                                                     Norwich, New York 13815

         EIGHTH:  For the  management of the business and for the conduct of the
affairs of the Corporation, and in further definition, limitation and regulation
of the powers of the Corporation and of its directors and of its stockholders or
any class thereof, as the case may be, it is further provided:

                  A. The  management  of the  business  and the  conduct  of the
affairs of the Corporation shall be vested in its Board of Directors. The number
of  directors  shall be fixed by, or in the manner  provided  in,  the  By-Laws.
Directors  need not be elected  by written  ballot,  unless so  required  by the
By-Laws of the Corporation.

                  B. After the original or other By-Laws of the Corporation have
been adopted,  amended, or repealed,  as the case may be, in accordance with the
provisions  of  Section  109 of the  General  Corporation  Law of the  State  of
Delaware,  and after the  Corporation  has  received  any payment for any of its
stock,  the power to adopt,  amend, or repeal the By-Laws of the Corporation may
be exercised by the Board of Directors of the Corporation.

         NINTH: Meetings of stockholders may be held within or without the State
of Delaware,  as the By-Laws may provide.  The books of the  Corporation  may be
kept  (subject to any provision  contained in the statute)  outside the State of
Delaware at such place or places as may be  designated  from time to time by the
Board of Directors or in the By-Laws of the Corporation.

         TENTH:  From time to time, any of the provisions of this Certificate of
Incorporation  may  be  amended,  altered  or  repealed,  and  other  provisions
authorized  by the laws of the  State of  Delaware  at the time in force  may be
added or inserted,  all in the manner now or hereafter prescribed by the laws of
the State of Delaware,  and all rights and powers at any time conferred upon the
stockholders  and  the  directors  of the  Corporation  by this  Certificate  of
Incorporation are granted,  subject to the provisions of this Article TENTH. The
provisions  set forth in Article  ELEVENTH may not be repealed or amended in any
respect,  unless such action is approved by the affirmative  vote of the holders
of not less than eighty percent (80%) of the outstanding  shares of Voting Stock
(as defined in Article ELEVENTH) of the Corporation; provided, however, if there
is a Major Stockholder as defined in Article ELEVENTH, such eighty percent (80%)
vote must include the  affirmative  vote of at least eighty percent (80%) of the
outstanding  shares of voting  stock held by  shareholders  other than the Major
Stockholder.

(B)      ELEVENTH:

         (a) The affirmative vote of the holders of not less than eighty percent
(80%) of the total voting power of all  outstanding  shares  entitled to vote in
the election of any particular  Class of Directors (as defined in Section (c) of
this Article ELEVENTH) and held by disinterested shareholders (as defined below)
shall  be  required  for  the  approval  or   authorization   of  any  "Business
Combination," as defined and set forth below:


                  (1) Any merger, consolidation or other business reorganization
or combination  of the  Corporation  or any of its  subsidiaries  with any other
corporation that is a Major Stockholder of the Corporation;

                  (2) Any sale, lease or exchange by the Corporation of all or a
substantial part of its assets to or with a Major Stockholder;

                  (3) Any issue of any stock or other security of the
Corporation or any of its subsidiaries for cash, assets or securities of a Major
Stockholder;

                  (4) Any reverse  stock  split of, or  exchange of  securities,
cash  or  other  properties  or  assets  of any  outstanding  securities  of the
Corporation  or any of its  subsidiaries  or  liquidation  or dissolution of the
Corporation  or any of its  subsidiaries  in any  such  case  in  which  a Major
Stockholder  receives  any  securities,  cash or  other  assets  whether  or not
different  from those  received or retained by any holder of  securities  of the
same class as held by such Major Shareholder.

(B)      AS AMENDED FEBRUARY 21, 1986

The affirmative  vote required by this Article  ELEVENTH shall be in addition to
the vote of the  holders  of any  class or  series  of stock of the  Corporation
otherwise  required  by  law,  by any  other  Article  of  this  Certificate  of
Incorporation,  or as this Certificate of Incorporation  may be amended,  by any
resolution  of the Board of Directors  providing  for the issuance of a class or
series of stock,  or by any agreement  between the  Corporation and any national
securities exchange.

                  (b) For the purpose of this Article ELEVENTH:

                           (1)      The term "Major Stockholder" shall mean and
include any person,  corporation,  partnership, or other person or entity which,
together with its  "Affiliates" and "Associates" (as defined at Rule 12b-2 under
the  Securities  Exchange  Act of 1934),  "beneficially  owns"  (as  hereinafter
defined) in the aggregate five percent (5%) or more of the outstanding shares of
Voting Stock, and any Affiliates or Associates of any such person,  corporation,
partnership, or other person or entity.

                           (2)      The term "Substantial Part" shall mean more
than  twenty-five   percent  (25%)  of  the  fair  market  value  of  the  total
consolidated  assets of the  Corporation in question,  or more than  twenty-five
percent (25%) of the  aggregate par value of authorized  and issued Voting Stock
of the Corporation in question,  as of the end of its most recent fiscal quarter
ending prior to the time the determination is being made.

                           (3)      The term "Voting Stock" shall mean the stock
of Corporation entitled to vote in the election of directors.


                           (4)      The term "Beneficial Owner" shall mean any
person and certain related  parties,  directly,  or indirectly who own shares or
have the right to acquire or vote shares of the company.

                           (5)      The term "Disinterested Shareholder" shall
mean any  holder of voting  securities  of the  company  other  then (i) a Major
Stockholder  if it or any of them has a financial  interest  in the  transaction
being  voted on (except  for a financial  interest  attributable  solely to such
person's  interest as a  stockholder  of the company  which is  identical to the
interests  of all  stockholders  of the same class) and (ii) in the context of a
transaction  described in (a) (4) above, any Major  Stockholder  (whether or not
having a financial  interest  described in clause (i) of this sentence) if it or
any of them has  directly or  indirectly  proposed  the  transaction,  solicited
proxies to vote in favor of the transaction,  financed any such  solicitation of
proxies or entered into any contract,  arrangement,  or  understanding  with any
person for the voting of securities of the company in favor of the transaction.

                  (c) The  provisions  of this  Article  shall  not  apply  to a
Business  Combination  which is approved by  sixty-six  and  two-thirds  percent
(66-2/3%) of those members of the Board of Directors who were directors prior to
the time when the Major Stockholder became a Major  Stockholder.  The provisions
of this  Article  shall not apply to a Business  Combination  which (i) does not
change any stockholder's percentage ownership in the shares of stock entitled to
vote in the election of directors of any successor of the  Corporation  from the
percentage  of the  shares  of  Voting  Stock  owned by such  stockholder;  (ii)
provides for the  provisions  of this  Article  without any  amendment,  change,
alteration, or deletion, to apply to any successor to the Corporation; and (iii)
does not  transfer  all or a  Substantial  Part of the  Corporation's  assets or
Voting Stock other than to a wholly-owned subsidiary of the Corporation.

                  (d)  Nothing contained in the Article shall be construed to
relieve a Major  Stockholder  from any fiduciary  obligation  imposed by law. In
addition, nothing contained in this Article hall prevent any stockholders of the
Corporation  from objecting to any Business  Combination  and from demanding any
appraisal rights which may be available to such stockholder.

(C)

                  (e) The Board of Directors of the Corporation shall be divided
into three classes:  Class 1,Class 2 and Class 3, which shall be as nearly equal
as  possible.  Each  Director  shall  serve for a term ending on the date of the
third Annual Meeting of Stockholders  following the Annual Meeting at which such
Director was elected;  provided,  however, that each initial Director in Class 1
shall hold office until the Annual Meeting of Stockholders in 1987; each initial
Director in Class 2 shall hold office until the Annual  Meeting of  Stockholders
in 1988; and each initial Director in Class 3 shall hold office until the Annual
Meeting of Stockholders  in 1989.  Such initial  Directors for each of the three
Classes of Directors  shall be as follows:  Class 1 - John M. Kolbas and Paul O.
Stillman; Class 2 - Donald E. Stone,


Darryl R.  Gregson  and Paul R.  Enggaard;  Class 3 - Everett A.  Gilmour,  J.K.
Weinman and Thomas J. Mirabito.  In the event of any increase or decrease in the
authorized  number  of  Directors,  (1)  each  Director  then  serving  as  such
nevertheless  continue as a Director of the Class of which he is a member  until
the  expiration of his current term,  or his earlier  resignation,  removal from
office or death, and (2) the newly created or eliminated directorships resulting
from such  increase or decrease  shall be  appointed  by the Board of  Directors
among the three  Classes of Directors  so as to maintain  such classes as nearly
equal as  possible.  Notwithstanding  any of the  foregoing  provisions  of this
Article  ELEVENTH,  each Director shall serve until his successor is elected and
qualified or until his earlier resignation, removal from office or death.

(D) TWELTH: A director of the Corporation  shall not be personally liable to the
Corporation  or its  stockholders  for monetary  damages for breach of fiduciary
duty as director  except for liability (i) for any breach of the director's duty
of loyalty to the  Corporation of its  stockholders,  (ii) for acts of omissions
not in good faith or which involve intentional misconduct or a knowing violation
of law, (iii) under Section 174 of the Delaware General  Corporation Law, as the
same exists or hereafter may be amended,  or (iv) for any transaction from which
the director  derived an improper  personal  benefit.  If the  Delaware  General
Corporation  Law  hereafter is amended to authorize the further  elimination  or
limitation of the  liability of  directors,  then the liability of a director of
the Corporation,  in addition to the limitation on personal  liability  provided
herein, shall be limited to the fullest extent permitted by the amended Delaware
General  Corporation  Law. Any repeal or  modification  of this paragraph by the
stockholders  of the  Corporation  shall be  prospective  only,  and  shall  not
adversely  affect any limitation on the personal  liability of a director of the
Corporation existing at the time of such repeal or modification.

(C)      PARAGRAPH (E) ADDED BY AMENDMENT FEBRUARY 21, 1986.

(D)      ARTICLE TWELFTH ADDED BY AMENDMENT FEBRUARY 28, 1987.