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Emperor Tenji's Rokoku Water Clock: Timekeeping Revolution (+ 9 more historical events on this day!)
A Daily Dose of History (10 Jun 2026)
Today's historical events:
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.
The Battle of Pelekanon results in a Byzantine defeat by the Ottoman Empire.
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.
Willem Barents and Jacob van Heemskerk…
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