1079

Events 
 Persian astronomer, Omar Khayyám, determined the length of the year as 365.24219858156 days which has been the most accurate calculation of old times. Khayyam also wrote Demonstrations of Problems in Algebra, produced a complete classification of cubic equations and their geometric answers.
 Murder of Saint Stanislaus of Szczepanów (pol. Stanisław ze Szczepanowa) by Polish King Bolesław II the Bold
 Upon the death of Håkan the Red, Halsten returns as king of Sweden, jointly with his brother Inge the Elder.
 Ladislaus Herman succeeds Boleslaus II in Poland.
 William I of England establishes the New Forest.
 Constance of Burgundy founds a monastery in Burgos.

 Births 
 August 8 – Emperor Horikawa of Japan (d. 1107)
 Peter Abelard, French scholastic philosopher (d. 1142)

 Deaths 
 April 11 – Stanislaus of Szczepanów, bishop of Kraków
 date unknown
 Adela of France, Countess of Flanders, wife of Baldwin V, Count of Flanders and mother of Matilda of Flanders, Queen of England (born 1010)
 Agatha of Hungary, wife of Edward the Exile (born 1024)
 Agatha of Normandy, Queen of Castile, daughter of William the Conqueror (born 1064)
 Håkan the Red, king of Gothenland since 1070 and king of Sweden since 1075

 References