Ajloun Castle, medieval name Qalʻat ar-Rabad, is a 12th-century Muslim castle situated in northwestern Jordan. It is placed on a hilltop belonging to the Mount Ajloun district. From its high ground the castle was guarding three wadis which descend towards the Jordan Valley. It was built by the Ayyubids in the 12th century and enlarged by the Mamluks in the 13th century.
Ajlun Castle is located on the site of an old monastery, traces of which were discovered during archaeological excavations. The site was rebuilt as a castle in 1184 by Izz al-Din Usama, a general in the army of Saladin. The castle controlled traffic along the road connecting Damascus and Egypt. According to Saladin's historian Baha ad-Din ibn Shaddad, the fortress was primarily built in order to help the authorities in Damascus control the Bedouin tribes of the Jabal 'Auf. These enjoyed enough autonomy as to ally themselves to the Crusaders, and had at one point set up a 100-tent camp next to the Hospitaller castle of Belvoir on the opposite side of the Jordan Valley. As such, Ajlun Castle is one of the very few Muslim fortresses built by the Ayyubids to protect their realm against Crusader incursions, which could come from Beisan or Belvoir in the west and from Karak in the south.
The original castle had four corner towers connected by curtain walls and a double gate. Arrow slits were incorporated in the thick walls and it was surrounded by a moat averaging 16 meters in width and 12–15 meters in depth.
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, emir of Aleppo and Damascus, who restored the northeastern tower and used the castle as an administrative center.
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-Ma'ni 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.
Ajlun castle is open for tourism. Many areas of the castle can be explored. Tourists in Jordan often visit the castle. Inside there is also a museum exhibition with many interesting artifacts from the various time periods of the region.
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