Wikipedia:Selected anniversaries/August 20

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August 20: St. Stephen's Day in Hungary; Jamshedi Navroz (New Year) to Zoroastrian Parsis in India (2005).

636 - Arab forces led by Khalid bin Walid took control of Syria and Palestine in the Battle of Yarmuk, marking the first great wave of Muslim conquests and the rapid advance of Islam outside Arabia.
917 - Tsar Simeon I of Bulgaria invaded Thrace and drove the Byzantines out.
1882 - Pyotr Ilyich Tchaikovsky's "1812 Overture" debuted in Moscow.
1968 - The "Prague Spring" abruptly ended when 200,000 Warsaw Pact troops and 5,000 tanks invaded Czechoslovakia.
1991 - Estonia regained its independence in the Singing Revolution as part of the collapse of the Soviet Union.