The Knights Hospitaller were an order that existed during the Crusades, and operated out of a hospital in Jerusalem, hence the name "Hospitaller". Like the Knights Templar, they were both monks and knights, swearing a vow to poverty, chastisty and obedience. Their main role was to protect Christian pilgrims entering the Holy Land from "the infedels".

All information obtained;
www.middle-ages.org.uk/knights-hospitaller.htm

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