1079 Omar ibn Ibrahim al-Chajjam completes Jalali-calendar
1323 Treaty of Paris - Flemish relinquish claims over the County of Zeeland
1447 Tommaso Parentucelli succeeds Pope Eugene IV as Nicolas V
1454 Thirteen Years' War: Delegates of the Prussian Confederation pledge allegiance to Casimir IV of Poland, and the Polish king agrees to help in their struggle for independence from the Teutonic Knights.
1479 Treaty of Alcaçovas: Portugal gives the Canary Islands to Castile in exchange for claims in West Africa