The Military Order of the Knights of Saint Lazarus - Crusades History

The Order of Saint Lazarus of Jerusalem, also known as the Leper Brothers of Jerusalem or simply as Lazarists, was a Catholic military order founded by crusaders around 1119 at a leper hospital in Jerusalem, Kingdom of Jerusalem, whose care became its original purpose, named after their patron saint, Lazarus. It was recognised by King Fulk of Jerusalem in 1142 and canonically recognised as a hospitaller and military order of chivalry under the rule of Saint Augustine in the Papal bull Cum a Nobis Petitur of Pope Alexander IV in 1255. Although they were centered on their charism of caring for those afflicted with leprosy, the knights of the Order of Saint Lazarus notably fought in the Battle of La Forbie in 1244 and in the Defense of Acre in 1291. The titular seat was successively situated at Jerusalem, Saint-Jean-d'Acre and - after the fall of the Kingdom of Jerusalem - split in two main branches in Italy and in Château Royal de Boigny-sur-Bionne in France.

In 1489, Pope Innocent VIII attempted to merge the order and its land holdings with the Knights Hospitaller. This was resisted by the larger part of the jurisdictions of the Order of Saint Lazarus including those in France, Southern Italy, Hungary, Switzerland, and England. The Knights Hospitaller only managed to appropriate the Lazarus holdings in Germany.

In 1572, the Order of Saint Lazarus in Italy was merged with the Order of Saint Maurice under the Royal House of Savoy to form the Order of Saints Maurice and Lazarus, which still exists until today, widely recognised as a dynastic successor of the Italian branch. This merger however excluded the holding in the southern part of Italy, then forming part of the Spanish realm. These were transformed into ecclesiastical benefices. The Duke of Savoy only managed to gain control of those benefices sited in the duchy of Savoy.

In 1608, King Henry IV of France, with the approval of the Holy See, linked the French section administratively to the Order of Our Lady of Mount Carmel to form the Royal Military and Hospitaller Order of Our Lady of Mount Carmel and Saint Lazarus of Jerusalem united. This branch became closely linked to the Royal Crown during the 18th century with the serving grand masters then being members of the Royal family. It suffered the consequences of the French Revolution, and went into exile along with its grand master Louis-Stanislas-Xavier, Comte (count) de Provence, king-in-exile Louis XVIII. It formally lost its Royal protection in 1830 and then ceased to remain listed as of royal protection in the French Royal Almanac.

The word lazarette, in some languages being synonymous with leprosarum, is believed to also be derived from the hospitaller Order of Saint Lazarus, these edifices being adopted into quarantine stations in the fifteenth century when leprosy was no longer the scourge it had been in earlier centuries.

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