An earlier incarnation of the Forty Thieves existed centuries ago who dwelled within their ancient hideout that could only be accessed by uttering the magic words "Open Sesame". Despite their notoriety, they were fought and presumably defeated by the legendary Ali Baba, and the tale of him and the Forty Thieves would later be magically preserved in story by the queen Scheherazade.
It was either before or around the time of the Forty Thieves that a ship that contained the legendary Hand of Midas sank in the waterways of the hideout of the Forty Thieves and a mural explaining the secrets of the Hand were carved within the deepest chambers of the hideout by an unknown individual or group, although whether the Forty Thieves or Ali Baba had anything to do with this remains unknown.
Centuries later, the old hideout of the Forty Thieves was discovered by a man named Cassim who would end up becoming the King of Thieves after making his own successor to the Forty Thieves out of former cutthroats and enforced a solemn rule, for them to never harm the innocents they steal from.
When Aladdin first discovered the Genie, Genie briefly told him of Ali Baba and the Forty Thieves and conjured up magical recreations of a few of the Forty Thieves to battle Aladdin which Genie then easily disposed of to prove to Aladdin just how powerful he is with his own genie.
The Forty Thieves were a group of bandits led by their chief Cassim and his second-in-command, Sa'Luk, where they stole lots of beautiful treasure given as gifts for Aladdin and Jasmine during the wedding. Despite their ruthless behavior using weapons to steal, they are not seen inflicting any physical harm against innocent people, as Cassim himself already wrote up a new rule in their code after becoming their leader: never harm the innocent, in which the Forty Thieves would have to keep to stay in touch with their group.
There were originally forty thieves hence the name Forty Thieves, however due to the betrayal of Sa'Luk, who informed the location to Razoul after being replaced by Aladdin during a fight between them, 31 Thieves got arrested and somehow seven of them managed to evade them. The 31 Thieves vow that Sa'Luk will pay for his betrayal, even when Sa'luk closes the door on them. Upon returning to the hideout, Sa'Luk then convinced the remaining seven thieves that it was Cassim who was responsible for betraying them and convinced them to mutiny against him. Eventually, in an act of justice during the climax, Sa'Luk ended up being turned to a golden statue by the Hand of Midas as punishment, as well as the seven thieves having turned their boat into solid gold, sinking the boat. It is unknown if the seven thieves survived, or if they got arrested, or if they drowned or not.
After the arrest of most of its members, the death of Sa'Luk and Cassim's desire to pursue a new life, the Forty Thieves no longer has any active members.
- Cassim (leader)
- Aladdin (second in command)
- Sa'Luk (former second-in-command and then leader, deceased)
- Triplet Thieves
- Small Thief
- BuckTooth Thief
- One Eye Thief
- Grinning Thief
- Smiling Thief
- Fellow Thief
- Little Man Thief
- Short Moustache Thief
- Bigger Moustache Thief
- Big Bearded Thief
- Abis Mal's Thugs
- 16 other members