The twentieth day of December.
- 69: Vespasian, a former general under Nero, enters Rome to claim the title of emperor. Vespasian's son Titus continues the siege on Jerusalem.
- 1192: Richard the Lion-Heart is captured and imprisoned by Leopold V of Austria on his way home to England after signing a treaty with Saladin ending the crusade.
- 1522: Suleiman the Magnificent accepts the surrender of the surviving Knights of Rhodes, who are allowed to evacuate. They eventually settle on Malta and become known as the Knights of Malta.
- 2005: US District Court Judge John E. Jones III rules against mandating the teaching of "intelligent design" in his ruling of Kitzmiller v. Dover Area School District.
- 217: Pope Zephyrinus
- Dominic of Silos
- O Clavis David (O key of David)
- Ursicinus of Saint-Ursanne
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