Yousaf Bin Tashfeen in Urdu

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; reigned c. 1061 – 1106) was leader of the Berber Almoravid empire. He co-founded the city of Marrakesh and led the Muslim forces in the Battle of Sagrajas. Ibn Tashfin came to al-Andalus from Africa to help the Muslims fight against Alfonso VI, eventually achieving victory and promoting an Islamic system in the region. In 1061 he took the title “amir al-Muslimin” recognising the suzerainty of the Abbasid Caliphate whom he became a vassal of. He was married to Zaynab an-Nafzawiyyah, whom he reportedly trusted politically.

Yusuf ibn Tashfin was a Berber from the Banu Turgut, a branch of the Lamtuna, a Tuareg tribe belonging to the Sanhaja group. The Sanhaja were linked by medieval Muslim genealogists with the Yemeni tribe of Himyar through semi-mythical and mythical pre-Islamic kings and for some reason, some of the contemporary sources (e.g., Ibn al-Arabi) add the nisba al-Himyari to Yusuf's name to indicate this legendary affiliation. Modern scholarship rejects this Berber–Yemeni link as fanciful.

Abu Bakr ibn Umar, a natural leader of Lamtuna extraction, a branch of the Sanhaja, and one of the original disciples of ibn Yasin who served as a spiritual liaison for followers of the Maliki school of Islamic jurisprudence, was appointed chief commander after the death of his brother Yahya ibn Umar al-Lamtuni. His brother oversaw the military for ibn Yasin but was killed in the Battle of Tabfarilla against the Godala tribes in 1056. Ibn Yasin, too, would die in battle against the Barghawata three years later. Abu-Bakr was an able general, taking the fertile Sūs and its capital Aghmāt a year after his brother's death, and would go on to suppress numerous revolts in the Sahara--on one such occasion entrusting his pious cousin Yusuf with the stewardship of Sūs and thus the whole of his northern provinces. He appears to have handed him this authority in the interim but even went as far as to give Yusuf his wife, Zaynab an-Nafzawiyyat, purportedly the richest woman of Aghmāt. This sort of trust and favor on the part of a seasoned veteran and savvy politician reflected the general esteem in which Yusuf was held, not to mention the power he attained as a military figure in his absence. Daunted by Yusuf's new-found power, Abu Bakr saw any attempts at recapturing his post politically unfeasible and returned to the fringes of the Sahara to settle the unrest of the southern frontier.

In the year 1091, the last sovereign king of al-Andalus, al-Mu'tamid, saw his Abbadid-inherited taifa of Seville, controlled since 1069, in jeopardy of being taken by the increasingly stronger king of Castile-León, Alfonso VI. The Taifa period followed the demise of the Umayyad Caliphate. Previously, the emir had launched a series of aggressive attacks on neighboring kingdoms, so as to amass more territory for himself, but his military aspirations and capabilities paled in comparison to those of the Castilian king, who in the name of Christendom, in 1085, captured Toledo and exacted parias, or tribute, from Muslim princes in places such as Granada, al-Mu'tamid of Seville being no exception. The tribute of the emirs bolstered the economy of the Christian kingdom, and harmed the Muslim economy. These are the circumstances that led to the Almoravid conquest and the famous quote, rebuffing his son, Rashid, who advised him not to call on Yusuf ibn Tashfin, where al-Mu'tamid said

I have no desire to be branded by my descendants as the man who delivered al-Andalus as prey to the infidels. I am loath to have my name cursed in every Muslim pulpit. And, for my part, I would rather be a camel-driver in Africa than a swineherd in Castile.