Yusuf ibn Tashfin, also Tashafin, Teshufin, (Arabic: يوسف بن تاشفين ناصر الدين بن تالاكاكين الصنهاجي, romanized: Yūsuf ibn Tāshfīn Naṣr al-Dīn ibn Tālākakīn al-Ṣanhājī, Berber languages: ⵢⵓⵙⴼ ⵓⵜⴰⵛⴼⵉⵏ; reigned c. 1061 – 1106) was a Sanhaja leader of the Almoravid Empire. He cofounded the city of Marrakesh and led the Muslim forces in the Battle of Sagrajas.
Yusuf ibn Tashfin came to al-Andalus from the Maghreb to help the Muslims fight against Alfonso VI of León, eventually achieving victory in Sagrajas and promoting an Islamic legal system in the region. In 1061 he took the title Amir al-Muslimin "Leader of the Muslims", recognizing the suzerainty of the Abbasid caliph as Amir al-Mu'minin "Leader of the Believers".
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