Ya'qub ibn Ishaq al-Tamimi (Arabic: يعقوب بن إسحاق التميمي) was a pirate in Fatimid service who led a major raid against the Italian coasts, Sardinia and Corsica in 934–935.
Ya'qub was dispatched by Caliph al-Qa'im with a fleet of 20 vessels (according to the 15th-century Isma'ili historian Imadaddin Idris; Sunni sources report 30 ships) on 22 June 934 from al-Mahdiyya.
Sailing from a western direction, he encountered some Christian merchant vessels, which he plundered and whose crews he took captive.
During his return journey, he was attacked by Byzantine ships who had mobilized on the news of the sack of Genoa, but defeated them.
[1][2] His brother Khalil was a senior commander in Fatimid service, in charge of the Arab jund of Kairouan from at least 913 to his death in 944.