St. Eustachius Custom MedalAvailable in Sterling Silver, 14kt Yellow Gold, and 14kt Gold Filled. Three sizes to choose from: Large: 1 x 3 4 inch Standard: 3 4 x 1 2 inch Charm: 1 2 x 1 4 inch A Christian martyr and soldier saint, Eustachius was a Roman general named Placidus before converting to Christianity. While hunting near Rome, he saw a vision of a Crucifix lodged between a stag's antlers. He was immediately converted, and soon had himself and his family baptized.