August 20：Qixi Festival (Chinese calendar, 2015); Day of Restoration of Independence in Estonia (1991); St. Stephen's Day in Hungary
August 20 is the 232nd day of the year (233rd in leap years) in the Gregorian calendar. There are 133 days remaining until the end of the year.
Events：
14 – Agrippa Postumus, adopted son of the late Roman emperor Augustus, is executed by his guards while in exile under mysterious circumstances.
636 – Battle of Yarmouk: Arab forces led by Khalid ibn al-Walid take control of Syria and Palestine away from theByzantine Empire, marking the first great wave of Muslim conquests and the rapid advance of Islam outside Arabia.
917 – Battle of Acheloos: Tsar Simeon I of Bulgaria decisively defeats a Byzantine army.
1000 – The foundation of the Hungarian state by Saint Stephen, celebrated as a National Day in Hungary.
1083 – Canonization of the first King of Hungary, Saint Stephen and his son Saint Emeric.
1308 – Pope Clement V pardons Jacques de Molay, the last Grand Master of the Knights Templar, absolving him of charges of heresy.
1391 – Konrad von Wallenrode becomes the 24th Hochmeister of the Teutonic Order.
1467 – The Second Battle of Olmedo takes places as part of a succession conflict between Henry IV of Castile and his half-brother Alfonso, Prince of Asturias.
1519 – Philosopher and general Wang Yangming defeats Zhu Chenhao, ending the Prince of Ning rebellion against the reign of the Ming Dynasty emperor Zhengde.
1672 – Former Grand Pensionary Johan de Witt and his brother Cornelis are brutally murdered by an angry mob in The Hague.
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