[1] 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.
[2] 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".
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.
[6] 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.
Al-Adil suspected that Izz al-Din was colluding with az-Zahir Ghazi, even telling historian Sibt ibn al-Jawzi that letters to that effect had been found.