On Isthmian crowns see Oscar Broneer, “The Isthmian Victory Crown,” American Journal of Archaeology 66 (1962) pp. 259–263; cf. the same author’s more general discussions, “The Apostle Paul and the Isthmian Games,” The Biblical Archaeologist 25 (1962), pp. 2–31; and “Paul and Pagan Cults at Isthmia,” Harvard Theological Review 64 (1971) pp. 185–186.