Ingenpedia:OnThisDay/December 21


 * AD 69 – The Roman Senate declares Vespasian emperor of Rome, the last in the Year of the Four Emperors.[1]
 * 1124 – Pope Honorius II is consecrated, having been elected after the controversial dethroning of Pope Celestine II.[2]
 * 1140 – Conrad III of Germany besieges Weinsberg.
 * 1237 – The city of Ryazan is sacked by the Mongol army of Batu Khan.[3]
 * 1361 – The Battle of Linuesa is fought in the context of the Spanish Reconquista between the forces of the Emirate of Granada and the combined army of the Kingdom of Castile and of Jaén resulting in a Castilian victory.
 * 1598 – Battle of Curalaba: The revolting Mapuche, led by cacique Pelentaru, inflict a major defeat on Spanish troops in southern Chile.
 * 1620 – Plymouth Colony: William Bradford and the Mayflower Pilgrims land on what is now known as Plymouth Rock in Plymouth, Massachusetts.
 * 1826 – American settlers in Nacogdoches, Mexican Texas, declare their independence, starting the Fredonian Rebellion.
 * 1832 – Egyptian–Ottoman War: Egyptian forces decisively defeat Ottoman troops at the Battle of Konya.