The occupation of the Citadel Hill by the Crusader Kingdom of Jerusalem is so far based only on interpretations of Crusader sources. William of Tyre writes in his ''Historia'' that in 1161 Philip of Milly received the castle of "Ahamant", which is seen to refer to Amman, as part of the lordship of Oultrejordain. In 1166 Philip joined the military order of the Knights Templar, passing on to them a significant part of his fief including the castle of Ahamant or "Haman", as it is named in the deed of confirmation issued by King Amalric. By 1170, Amman was in Ayyubid hands. The remains of a watch tower on Citadel Hill, first attributed to the Crusaders, now are preferentially dated to the Ayyubid period, leaving it to further research to find the location of the Crusader castle. During the Ayyubid period, the Damascene geographer al-Dimashqi wrote that Amman was part of the province of al-Karak, although "only ruins" remained of the town.