From CojsWiki
Royal Crusader seal, inscribed: “City of the king, the king of kings;: in center, from left to right, depictions of the Holy Sepulchre, David’s Tower and Dome of the Rock.
Bahat, Dan, “The Crusaders,” Jerusalem: 5000 Years of History. Les Dossiers D’Archeologie, Special Issue, March 1992.