1 Exhibit 23(a) INDEPENDENT AUDITORS' CONSENT We consent to the incorporation by reference in this Registration Statement of Cincinnati Financial Corporation on Form S-8 of our reports dated February 4, 1999, appearing in and incorporated by reference in the Annual Report on Form 10-K of Cincinnati Financial Corporation for the year ended December 31, 1998 and to the reference to us as experts in this Registration Statement. Deloitte & Touche LLP Cincinnati, Ohio August 26, 1999 17