📅 Today in HistoryJune 10

Emperor Tenji of Japan introduces a water clock (clepsydra) called Rokoku. The instrument, which measures time and indicates hours, is placed in the capital of Ōtsu.

Third Crusade: Frederick I Barbarossa drowns in the river Saleph while leading an army to Jerusalem.

Pope Honorius III issues the bull Vineae Domini custodes in which he approves the mission of Dominican friars to Morocco.

The Battle of Pelekanon is the last attempt of the Byzantine Empire to retain its cities in Asia Minor.

Battle of Mello: The peasant forces of the Jacquerie are crushed by the army of the French nobility.

Ottoman Sultan Murad II besieges Constantinople, but is ultimately unsuccessful.

Copenhagen is surrounded by the army of Frederick I of Denmark, as the city will not recognise him as the successor of Christian II of Denmark.

Council of Trent: Pope Paul III sends out letters to his bishops, delaying the Council due to war and the difficulty bishops had traveling to Venice.

Willem Barents and Jacob van Heemskerk discover Bear Island.

Thirty Years' War: Battle of Záblatí, a turning point in the Bohemian Revolt.