عبد الله بن ياسين
Abu Zakariyya Yahya ibn Umar ibn Talagagin ibn Turgut ibn Wartasin, commonly suffixed al-Lamtuni al-Sanhaji, (d. near Azuggi, 1056; Arabic : يحيى إبن عمر) was a chieftain of the Lamtuna, a tribe in the Sanhaja confederation. Yahya ibn Umar was the first emir of the Almoravids in the mid-11th century, a movement he constructed in collaboration with the religious leader Abdallah ibn Yasin. Yahya led the Almoravid armies in their first campaigns, including captures of Sijilmassa and Awdaghost in 1054/55, but was himself killed in battle against a dissident Berber faction in the Adrar. Yahya was succeeded as Almoravid emir by his brother, Abu Bakr ibn Umar.