Year 1190 (MCXC) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. Events By place Byzantine Empire Spring – A German expeditionary force (some 15,000 men) led by Emperor Frederick I (Barbarossa) marches towards Constantinople, on the way to the Holy Land. Emperor Isaac II (Angelos), suspicious that Frederick is planning to conquer Constantinople, attempts to stop him by attacking the Crusaders. The German forces are too strong and they capture Adrianople. A peace treaty is signed by both Isaac and Frederick, that ensures the Germans are given supplies, and free passage through to Palestina. Isaac II starts a campaign against the Bulgarians, who claim their independence. After passing the Balkan Mountains, Isaac marches westward to besiege Tarnovo, the new Bulgarian capital. Meanwhile, the Byzantine fleet reaches the Danube River in order to block the way of Cuman reinforcements from the North. The defense of Tarnovo is led by Ivan Asen I, emperor (Tsar) of Bulgaria. After spreading rumors of the arrival of a Cuman army to relieve the city, Isaac orders to retreat to Stara Zagora. Battle of Tryavna: Byzantine forces under Isaac II are ambushed and defeated by the Bulgarians in a mountain pass, near Tryavna. In panic, the Byzantines break up and begin a disorganized retreat. Isaac barely escapes, his Varangian Guard has to cut a path through their own soldiers, enabling their emperor's flight from the rout. The Bulgarians capture the imperial treasure, including the golden helmet of Isaac, his crown, and the Imperial Cross which contains a wooden piece of the Holy Cross. Third Crusade March – Frederick I leaves Adrianople to Gallipoli at the Dardanelles to embark, with the help of Byzantine transports, to cross into Asia Minor. On April 25, he enters territory of the Seljuk Sultanate of Rum under the rule of Sultan Kilij Arslan II. Although promised to let the German Crusaders pass peaceably through his domains, Kilij Arslan harasses Frederick's forces with hit-and-run attacks. On May 7, a Turkish army (some 10,000 men) is defeated at the Battle of Philomelion, by 2,000 Crusaders. March 25 – Conrad of Montferrat sails south with a Crusader fleet (some 50 ships) from Tyre. As Conrad's fleet approaches the harbour of Acre, an equally sized Muslim fleet sorties out to meet the Crusaders in open battle. Eventually, the Ayyubid fleet is blockaded (supported by Danish and