Year 1121 (MCXXI) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. Events By place Byzantine Empire Emperor John II (Komnenos) recovers southwestern Anatolia (modern Turkey) from the Seljuk Turks and then hastens to the Balkans, where the Pechenegs are continuing their incursions. He transfers Byzantine troops to the Danube frontier at Paristrion. Levant Summer – Seljuk forces under Toghtekin make extensive raids into Galilee. King Baldwin II, in reprisal, crosses the Jordan River with a Crusader army, and ravages the countryside. He occupies and destroys a fortress that Toghtekin has built at Jerash. Europe March 2 – Petronilla of Lorraine becomes regent of Holland (Low Countries) after her husband, Floris II (the Fat) dies. He is succeeded by his 6-year-old son Dirk VI (or Theodoric). A large rebellion takes place in Córdoba (modern Spain) against the ruling Almoravid Dynasty. England January 24 – Adeliza of Louvain, age 17, marries King Henry I two months after the accidental death of the heir to the English throne, Henry's only legitimate son, William Adelin. Eurasia Summer – Sultan Mahmud II of the Seljuk Empire declares a Holy War on Georgia. He sends an expedition under Ilghazi ibn Arttuq, Artukid ruler of Mardin, to invade Georgia. August 12 – Battle of Didgori: King David IV (the Builder) of Georgia, with a Georgian army (55,600 men), defeats the 300,000-strong Seljuk coalition forces at Mount Didgori. Asia Emperor Hui Zong sends an expedition to crush the rebellion at Hangzhou (modern-day Zhejiang) in China. The rebels are defeated, their leader Fang La is captured and executed. By topic Religion Spring – Peter Abelard, a French theologian and philosopher, is condemned and charged with the heresy of Sabellius in a synod at Soissons. Abelard writes Sic et Non. April 22 – Antipope Gregory VIII (supported by Emperor Henry V) is arrested by papal troops at Sutri. He is taken to Rome and imprisoned in the Septizonium. December 25 (Christmas Day) – The Praemonstratensian Order (Norbertines) is formed, when a group of canons make solemn vows at Prémontré. Henry I founds Reading Abbey in England. The Cluniac Order populates the abbey. The third and largest church is completed at Cluny Abbey (modern France). L'Aumône Abbey is founded by Count Theobald IV of Blois at Loir-et-Cher. Births Ascelina, French Cistercian nun and mystic (d. 1195) Chōgen, Japanese Buddhist monk (kanjin) (d.