Pope Paschal II issued the papal bull Pie postulatio voluntatis, formally recognising the establishment of the Knights Hospitaller.

Pope Paschal II, born Raniero Raineri di Bleda, was head of the Catholic Church and ruler of the Papal States from 13 August 1099 to his death in 1118. A monk of the Abbey of Cluny, he was created the cardinal-priest of San Clemente by Pope Gregory VII (1073–85) in 1073. He was consecrated as pope in succession to Pope Urban II (1088–99) on 19 August 1099. His reign of almost twenty years was exceptionally long for a medieval pope.

A papal bull is a type of public decree, letters patent, or charter issued by the pope of the Catholic Church. It is named after the leaden seal (bulla) traditionally appended to authenticate it.

Pie postulatio voluntatis is a papal bull issued on 15 February 1113 by Pope Paschal II, in which the Pope formally recognized the establishment of the Knights Hospitaller and confirmed their independence and sovereignty. Today, the document is preserved at the National Library of Malta in Valletta, Malta.

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).