In 1183, he was ordered by Saladin to build the
Rabbadh Fortress at
Ajlun in northern
Jordan with the purpose of protecting Ayyubid holdings in area and threatening the
Crusader forces based in
Kerak to the south. Both the Rabbadh Fortress and the Crusader-built
Belvoir Castle in
Kawkab al-Hawa, west of the
Jordan River in the southern
Galilee, were granted by Saladin to Izz al-Din in the late 1180s as ''
iqta'a'' or "fiefs". They served as strategic fortifications commanding the
Jordan Valley. After the death of Saladin in 1193, his son
al-Afdal succeeded him in control of
Syria, but was seen by the local governors as abdicating his responsibilities of kingship for its favors. Rivalry grew between him and his brother,
al-Aziz Uthman of
Egypt. In 1194, Izz al-Din became the first local governor to defect from al-Afdal and left for Egypt in order to convince al-Aziz Uthman to launch a conquest against
Damascus. Five years later, in 1199, Izz al-Din secretly joined in a conspiracy to depose al-Afdal in favor of Saladin's brother
al-Adil. When al-Adil's forces besieged Damascus that year, Izz al-Din attempted to negotiate with al-Afdal's ally and brother based in
Aleppo,
az-Zahir Ghazi, to surrender Damascus to al-Adil. In 1202, when al-Adil achieved an unbreakable grip of the Ayyubid empire, Izz al-Din was allowed to remain in control of Ajlun and Kawkab al-Hawa. ==Demise==