Died in 1157

Feb 5 Conrad Margrave of Meissen the Margrave of Meissen from 1123 until his retirement in 1156. He was the son of Thimo, Count of Brehna, of the House of Wettin and Ida, daughter of Otto of Nordheim. He was also Count of Wettin, Brehna, and Camburg from before 1116
May 8 Ahmad Sanjar the Sultan of the Seljuq Empire from 1118 to 1153. He was initially the sultan of Khorasan until he gained the rest of the territory upon the death of Muhammad Bosworth notes Sanjar is a Turkic name, denoting "he who pierces", "thrusts"
May 15 Yuri Dolgorukiy a Rurikid prince and founder of Moscow. He reigned as Velikiy Kniaz of Kiev from September 1149 to April 1151 and then again from March 1155 to May 1157. Yuri played a key role in the transition of political power from Kiev to Suzdal following the death of his elder brother Mstislav the Great
Aug 5 Dirk VI Count of Holland Count of Holland between 1121 and 1157, at first, during his minority, under the regency of his mother Petronilla. He was the son of Count Floris After his death he was succeeded by his eldest son Floris III. He married Sofie of Salm, Countess of Rheineck and Bentheim. She was heiress of Bentheim, which she ruled together with her husband and which was inherited by the couple's second son Otto after his parents' death
Aug 9 Canute V of Denmark a King of Denmark from 1146 to 1157, as co-regent in shifting alliances with his Sweyn III and Valdemar Canute was killed at the so-called Bloodfeast of Roskilde in 1157. Nothing certain is known about his person and character
Aug 16 Ramiro II of Aragon King of Aragon from 1134 until withdrawing from public life in 1137. He was the youngest son of Sancho Ramírez, King of Aragon and Navarre and Felicia of Roucy
Aug 21 Alfonso VII of León and Castile born Alfonso Raimúndez, called the Emperor , became the King of Galicia in 1111 and King of León and Castile in 1126. Alfonso first used the title Emperor of All Spain, alongside his mother Urraca, once his mother vested him with the direct rule of Toledo in 1116. Alfonso later held another investiture in 1135 in a grand ceremony reasserting his claims to the Imperial title. He was the son of Urraca of León and Raymond of Burgundy, the first of the House of Burgundy to rule in the Iberian peninsula
Oct 23 Sweyn III of Denmark the King of Denmark between 1146 and 1157, in shifting alliances with Canute V and his own cousin Valdemar In 1157, the three agreed a tripartition of Denmark. Sweyn attempted to kill his rivals at the peace banquet, and was subsequently defeated by Valdemar I at the Battle of Grathe Heath and killed
Nov 4 Matilda of Savoy Queen of Portugal the first Queen of Portugal. Her husband was King Afonso I, the first sovereign of Portugal, whom she married in 1146