Janah ad-Dawla was the Arab Seljuq emir of Homs during the First Crusade.
He was the atabeg of Ridwan who took control of Aleppo after the death of Ridwan's father Tutush I in 1095.
[1] He later joined Kerbogha's army during the second siege of Antioch in 1098.
He was murdered by three Assassins in 1103, apparently by order of al-Hakim al-Munajjim and apparently instigated by Ridwan.
[2]