Events January 12–March 16 – Caliph Al-Muqtafi Successfully defended Baghdad against the coalition forces of Sultan Muhammad of Hamadan,and Atabeg Qutb-adin of Mosul Albert I of Brandenburg begins his ruthless program to pacify the Slavic region. June 11 – Albert I of Brandenburg, also called, The Bear (Ger: Albrecht der Bär), becomes the founder of the Margraviate of Brandenburg, Germany and the first Margrave. August 21 – Sancho III and Ferdinand II, the son… (More on 1157)