1079

Events

April 11 - Stanislaus of Szczepanów, bishop of Kraków, is executed on orders by King Bolesław II the Generous. The way in which his sentence is carried out causes a revolt among the Polish nobles. Bolesław is forced to flee, to take refuge at the court of King Ladislaus I of Hungary. He is succeeded by his brother Władysław I, as ruler of Poland.
Battle of Cabra: Moorish forces, aided by Castilian knights under El Cid, defeat and rout the invading army of Emir Abdallah ibn Buluggin of Granada, near the town of Cabra.
Emperor Henry IV appoints Frederick I as duke of Swabia at Hohenstaufen Castle. Henry's 7-year-old daughter Agnes of Waiblingen is betrothed to Frederick who founds the Hohenstaufen Dynasty.
Upon the death of Håkan the Red, Halsten Stenkilsson returns as king of Sweden, jointly with his brother Inge the Elder.

King William the Conqueror establishes the New Forest in Southern England. He proclaims it as a royal forest, using it for hunting, mainly of deer.

Omar Khayyam, Persian mathematician and astronomer, calculates a 33 year calendar consisting of 25 ordinary years that include 365 days, and 8 leap years that include 366 days, the most accurate calculation of his time. Khayyam, in his Treatise on Demonstrations of Problems in Algebra, produces a complete classification of cubic equations and their geometric solutions.