In 1143 Pope Celestine II ordered the Knights Hospitaller to take over management of a German hospital in Jerusalem, which, according to the chronicler Jean d'Ypres, accommodated the countless German pilgrims and crusaders who could neither speak the local language nor Latin ("patriæ linguam ignorantibus atque Latinam"). Although formally an institution of the Hospitallers, the pope commanded that the prior and the brothers of the "domus Theutonicorum" (house of the Germans) should always be Germans themselves, so a tradition of a German-led religious institution could develop during the 12th century in the Kingdom of Jerusalem.