After Usama’s death, the castle was enlarged in AD 1214–15 by Aibak ibn Abdullah, the Mamluk governor.
He added a new tower in the southeast corner and built the gate.
The castle lost its military importance after the fall of Karak in AD 1187 to the Ayyubids.
In the middle of the 13th century AD, the castle was conceded to Yousef ibn Ayoub, King of Aleppo and Damascus, who restored the northeastern tower and used the castle as an administrative centre.
In 1260 AD, the Mongols destroyed sections of the castle, including its battlements. Soon after the victory of the Mamluks over the Mongols at Ain Jalut, Sultan ad-Dhaher Baibars restored the castle and cleared the fosse.
The castle was used as a storehouse for crops and provisions. When Izz ad-Din Aibak was appointed governor, he renovated the castle as indicated by an inscription found in the castle’s south-western tower.
During the Ottoman period, a contingent of fifty soldiers was set inside the castle.
During the first quarter of the 17th century, Prince Fakhr ad-Din al-Mani II used it during his fight against Ahmad ibn Tarbay. He supplied the castle with a contingent and provided provisions and ammunition.
In 1812, the Swiss traveller Johann Ludwig Burckhardt found the castle inhabited by around forty people.
Two major destructive earthquakes struck the castle in 1837 and 1927.
Recently, the Department of Antiquities of Jordan has sponsored a program of restoration and consolidation of the walls and has rebuilt the bridge over the fosse.