Considered the most important of all the Roman Catholicmilitary orders, both for the extent of its area and for its duration, The Order of the Knights of Saint John of Jerusalem (Latin: Ordo Fratrum Hospitalis Sancti Ioannis Hierosolymitani), known as Hospitallers of Jerusalem until 1309, Knights of Rhodes from 1309 till 1522, and Knights of Malta since 1530, become in 1834 the Sovereign Military Order of Malta, which is even today a sovereign subject of international law, headquartered in Palazzo Malta in Rome.
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