St. Bonaventure 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 Bonaventure suffered from a perilous sickness when a child, but the prayers of Saint Francis of Assisi saved him. He joined the Order of Friars Minor at the age of 22 and studied philosophy in France. As a friend to Thomas Aquinas and King Saint Louis IX, he became a doctor of theology.