Jean de la Cassière, 51st Grandmaster of the Knights Hospitaller (born 1502)

Fra' Jean l'Evesque de la Cassière was the 51st Grand Master of the Order of Malta, from 1572 to 1581. He commissioned the building of the Conventual Church of the Order in Valletta, Malta, and is buried in its crypt.

The Order of Knights of the Hospital of Saint John of Jerusalem, commonly known as the Knights Hospitaller, is a Catholic military order. It was founded in the crusader Kingdom of Jerusalem in the 12th century and had its headquarters there, in Jerusalem and Acre, until 1291, thereafter being based in Kolossi Castle in Cyprus (1302–1310), the island of Rhodes (1310–1522), Malta (1530–1798), and Saint Petersburg (1799–1801).