Wikipedia:Selected anniversaries/January 27

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 * AD 98 – Trajan succeeded his adoptive father Nerva as Roman emperor; the Roman Empire reached its maximum extent under his rule.
 * 945 – The brothers Stephen and Constantine Lekapenos, having deposed their father as Byzantine emperor a few weeks earlier, were themselves overthrown by Constantine VII, their co-emperor.
 * 1343 – Clement VI issued the papal bull Unigenitus, justifying the power of the pope and the use of indulgences.
 * 1785 – The University of Georgia, one of the oldest public universities in the United States, was founded.
 * 1820 – A Russian expedition led by the naval officers Fabian Gottlieb von Bellingshausen and Mikhail Lazarev made the first sighting of the coast of Antarctica.
 * 1927 – A contaminated diphtheria vaccine was used in an Australian immunisation program, leading to the deaths of twelve children and the suspension of immunisation programs in several countries.
 * 1945 – The Soviet Red Army liberated about 7,000 prisoners left behind by the Nazis in Auschwitz concentration camp (entrance pictured).
 * 1965 – South Vietnamese prime minister Trần Văn Hương was removed by the military junta of Nguyễn Khánh.
 * 1967 – A fire during a launch simulation for the Apollo 1 mission at Cape Kennedy killed astronauts Gus Grissom, Ed White and Roger Chaffee.
 * 1974 – Brisbane, Australia, was flooded when the Brisbane River broke its banks.
 * 1980 – Six American diplomats who had evaded capture in the Iran hostage crisis escaped with the help of Canadian government officials to Zürich, Switzerland.
 * 2010 – Porfirio Lobo Sosa became the new president of Honduras, ending a constitutional crisis that had begun in 2009 when Manuel Zelaya was forcibly removed from office.
 * 2011 – Arab Spring: The Yemeni Revolution began as more than 16,000 protesters demonstrated in Sanaa to demand governmental changes.


 * Born/died this day: | Marcian |d|457| Edward of Angoulême |b|1365| Angela Merici |d|1540| Johann Nikolaus von Hontheim |b|1701| Eli Whitney Blake |b|1795| Eunice Hale Cobb |b|1803| John Perkins |d|1812| Sasaki Tōichi|b|1886| Giuseppe Verdi |d|1901|  Perfecto Yasay Jr. |b|1947| Yang Chuan-kwang |d|2007|

January 27


 * 1799 – French Revolutionary Wars: In the Macau Incident, French and Spanish warships encountered a British Royal Navy escort squadron in the Wanshan Archipelago; subsequent events, including which side retreated, were disputed by the commanders present.


 * 1996 – Mahamane Ousmane (pictured), the first democratically elected president of Niger, was deposed by Colonel Ibrahim Baré Maïnassara in a military coup d'état.
 * 2003 – The first selections for the United States National Recording Registry were announced by the Library of Congress.
 * 2011 – Astronomers documented H1504+65, a white dwarf in Ursa Minor with the hottest surface temperature known at the time, at 200,000 kelvins (360,000 °F).