Gerard Thom (The Blessed Gerard), founder of the Knights Hospitaller (born c. 1040)

Blessed Gerardo Sasso, was an Italian lay brother in the Benedictine Order who was appointed as rector of the hospice in Jerusalem at Muristan in 1080. In the wake of the success of the First Crusade in 1099, he became the founder of the Order of St John of Jerusalem, also known as the Knights Hospitaller, an organization that received papal recognition in 1113. As such, he was the first Grand Master of the Knights Hospitaller.

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).