1171 in history

Born in 1171

Aug 15 Alfonso IX of León king of León and Galicia from the death of his father Ferdinand II in 1188 until his own death. According to Ibn Khaldun , he is said to have been called the Baboso or Slobberer because he was subject to fits of rage during which he foamed at the mouth

Died in 1171

Feb 20 Conan IV Duke of Brittany duke of Brittany, from 1156 to 1166. He was the son of Alan the Black, 1st Earl of Richmond and Bertha of Brittany. Conan IV was his father's heir as 2nd Earl of Richmond and his mother's heir as Duke of Brittany. From his father's side, Conan was great great grandson of duke Geoffrey I and great grandson of Odo of Brittany. Conan and his daughter Constance would be the only representatives of the Penthièvre dynasty of Brittany to hold the Duchy's crown
Apr 3 Philip of Milly a baron in the Kingdom of Jerusalem and the seventh Grand Master of the Knights Templar. He briefly employed the troubadour Peire Bremon lo Tort in the Holy Land
May 1 Diarmait Mac Murchada a King of Leinster in Ireland. In 1167, he was deprived of his kingdom by the High King of Ireland – Ruaidri Ua Conchobair. The grounds for the dispossession were that MacMurrough had, in 1152, abducted Derbforgaill, the wife of the King of Breifne, Tiernan O'Rourke. To recover his kingdom, MacMurrough solicited help from King Henry II of England. In return, MacMurrough pledged an oath of allegiance to Henry, who sent troops in support. As a further thanks for his reinstatement, MacMurrough's daughter Aoife was married to Richard de Clare, the 2nd Earl of Pembroke. Henry II then mounted a larger second invasion in 1171 to ensure his control over Strongbow, resulting in the Lordship of Ireland. MacMurrough was later known as Diarmait na nGall
Jun 9 Rabbeinu Tam one of the most renowned Ashkenazi Jewish rabbis and leading French Tosafists, a leading halakhic authority in his generation, and a grandson of Rashi. Known as "Rabbeinu" , he acquired the Hebrew suffix "Tam" meaning straightforward; it was originally used in the Book of Genesis to describe his biblical namesake, Jacob
Jun 21 Walter de Luci the brother of Richard de Luci, who was Chief Justiciar of England.
Aug 8 Henry of Blois Abbot of Glastonbury Abbey from 1126, and Bishop of Winchester from 1129 to his death. He was a younger son of Stephen Henry, Count of Blois by Adela of Normandy, daughter of William the Conqueror and Matilda of Flanders. Thus, he was a younger brother of Stephen, King of England
Nov 8 Baldwin IV Count of Hainaut count of Hainaut from 1120 to his death. He was the son of Baldwin III, Count of Hainaut, and Yolande de Wassenberg