In the late 15th century the Cristian structure on the site, under custody of the Franciscans, was taken by the Muslim rulers, who built a mosque on it, allegedly after the Jews in Jerusalem told the Muslims that the site was David's Tomb. In response, the Pope issued an edict that any Jew, traveling by sea to the Holy Land, must be thrown overboard. Such edict was the main reason that Rabbi Ovadyah of Bartenora and Meshulam of Volterra has to disguise themselves as Christians during their sea travel to Jerusalem.
German accused of joining ISIS in Syria deported by Turkey (AP)
from the article: Who is 'Judaizing' King David's Tomb?