Year 1142 (MCXLII) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. Events By place Byzantine Empire Spring – Emperor John II Komnenos and his sons lead a Byzantine expeditionary force across Anatolia to Antalya. He drives back the Seljuks and Turcomans – who again are trying to invade Phrygia. John strengthens the frontier defences in northern Syria and sends an embassy to Germany – to seek an alliance against King Roger II of Sicily. To seal the alliance, the emissaries request that King Conrad III send a princess of his family to be married to the emperor's son, Manuel. Instead, Conrad selects his sister-in-law, Bertha of Sulzbach, and sends her to the Byzantine Empire escorted by Emicho of Leiningen, bishop of Würzburg. Late Summer – John II establishes a supply base for his further campaigns at Antalya. While waiting for reinforcements, his eldest son Alexios and appointed heir, falls ill and dies. His other two sons, Andronikos and Isaac are tasked to escort the body, but during the voyage Andronikos also dies. John continues his campaign against the Armenian kingdom of Cilicia – to re-conquer the fortresses that the Danishmends have taken. He appears by forced marches at Turbessel in mid-September. Meanwhile, Isaac brings the corpses of his two brothers back to Constantinople, where they are entombed in the Pantokrator Monastery. Europe King Louis VII the Younger of France becomes involved in a civil war with Theobald II ("the Great"), count of Champagne, by permitting his cousin Ralph I of Vermandois (seneschal of France) to repudiate his wife, Theobald's sister Eleanor of Champagne, and to marry Petronilla of Aquitaine, who was the sister of King Louis VII’s wife, Queen Eleanor of Aquitaine. Sigurd II, a Norwegian pretender, is joined in his efforts to overthrow the 7-year-old King Inge Haraldsson of Norway by Inge's older half-brother Eystein II, who becomes co-ruler. He receives one third of the late Harald's kingdom. May – Conrad III makes a peace agreement with the 13-year-old Henry the Lion at Frankfurt. He is appointed as duke of Saxony, which territories are deprived from his father, the late Duke Henry the Proud. Duke Władysław II the Exile attempts to subject his younger (half)-brothers to re-unite Poland. He is supported by the alliances with the Kievan Rus' and the Holy Roman Empire. Summer – Conrad III enters Bohemia to