0000708955-03-000049 4 1 20030408 20030409 FIRST FINANCIAL BANCORP /OH/ 0000708955 6021 311042001 OH 1231 4 34 000-12379 03643921 300 HIGH ST HAMILTON OH 45011 5138674700 300 HIGH ST HAMILTON OH 45011 MARCUM STEPHEN S 0001128308 DIRECTOR 4 OHIO CASUALTY CORP 9450 SEWARD ROAD FAIRFIELD OH 45014 5136032600 OHIO CASUALTY CORP 9450 SEWARD ROAD FAIRFIELD OH 45014 4 1 april03form4.txt APRIL03FORM4