EX-23 2 exh23.txt EXH 23 - ERNST & YOUNG LLP CONSENT TO FORM 11-K Exhibit 23 Consent of Independent Registered Public Accounting Firm We consent to the incorporation by reference in the following Registration Statements (Form S-8 Nos. 333-69895, 333-87413, 333-42944, 333-42942, 333- 73740, 333-73738, 333-88398, 333-91906 and 333-97987) pertaining to the Employee Savings Plan of Ohio Casualty Insurance Company of our report dated June 18, 2004, with respect to the financial statements and schedule of the Ohio Casualty Insurance Company Employee Savings Plan included in this Annual Report (Form 11-K) for the year ended December 31, 2003. /s/Ernst & Young, LLP Cincinnati, Ohio June 23, 2004