Lothair II (supported by Pope Honorius II) asks Frederick II to restore to the crown the estates that he has inherited from Henry V. Frederick refuses, and by year's end a succession dispute breaks out between the House of Welf and the House of Hohenstaufen. The latter is led by Frederick and his brother Conrad III, duke of Franconia.
November –Jin–Song War: Emperor Taizong of the Jurchen-led Jin dynasty declares war on the Chinese Song dynasty – and orders his armies to invade Song territory. He sends the Western army to the city of Taiyuan in Shanxi province and the Eastern army to Bianjing (modern-day Kaifeng), the Song capital. The Song forces are not expecting an invasion and are caught off guard.
↑Unité mixte de recherche 5648--Histoire et archéologie des mondes chrétiens et musulmans médiévaux. Pays d'Islam et monde latin, Xe-XIIIe siècle: textes et documents. Lyon: Presses Universitaires de Lyon.{{cite book}}: CS1 maint: numeric names: authors list (link)
↑de Oliveira Marques, António Henrique (1998). Histoire du Portugal et de son empire colonial. Paris: Karthala. p.44. ISBN2-86537-844-6.
↑McGrank, Lawrence (1981). "Norman crusaders and the Catalan reconquest: Robert Burdet and te principality of Tarragona 1129-55". Journal of Medieval History. 7 (1): 67–82. doi:10.1016/0304-4181(81)90036-1.
↑Mole, Frederick W. (1999). Imperial China: 900–1800, p. 196. Harvard University Press. ISBN978-0-674-01212-7.
↑Halm, Heinz (2014). Kalifen und Assassinen: Ägypten und der vordere Orient zur Zeit der ersten Kreuzzüge, 1074–1171[Caliphs and Assassins: Egypt and the Near East at the Time of the First Crusades, 1074–1171] (in German). Munich: C. H. Beck. p.165. doi:10.17104/9783406661648-1. ISBN978-3-406-66163-1.