The Battle of Sagrajas (23 October 1086), also called Zalaca or Zallaqah (Arabic: معركة الزلاقة, romanized: Maʿrakat az-Zallāqah), was a conflict fought in 1086 between the Almoravid army, led by their king, Yusuf ibn Tashfin, and the forces of King Alfonso VI of Castile.
Text from Wikipedia, licensed under CC BY-SA 4.0
The 941st anniversary falls on October 23, 2027.