October 20：Birth of the Báb, a holy day in the Bahá'í Faith
October 20 is the 293rd day of the year (294th in leap years) in the Gregorian calendar. There are 72 days remaining until the end of the year.
Events：
1548 – The city of Nuestra Señora de La Paz (Our Lady of Peace) is founded by Alonso de Mendoza by appointment of the king of Spain and Holy Roman Emperor, Charles V.
1572 – Relief of Goes, Cristóbal de Mondragón with 3000 soldiers of the Spanish Tercios, release the siege of the city.
1720 – Caribbean pirate Calico Jack is captured by the Royal Navy.
1740 – Maria Theresa takes the throne of Austria. France, Prussia, Bavaria and Saxony refuse to honour thePragmatic Sanction and the War of the Austrian Succession begins.
1781 – Patent of Toleration, providing limited freedom of worship, is approved in Habsburg Monarchy.
1803 – The United States Senate ratifies the Louisiana Purchase.
1805 – General Mack's army surrender to Napoleon I at Ulm after a few skirmishes.
1818 – The Convention of 1818 signed between the United States and the United Kingdom which, among other things, settles the Canada–United States border on the 49th parallel for most of its length.
1827 – Battle of Navarino: a combined Turkish and Egyptian armada is defeated by British, French, and Russian naval force in the port of Navarino in Pylos, Greece.
1873 – Yale, Princeton, Columbia, and Rutgers universities draft the first code of American football rules.
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