He was educated from a young age and was accustomed to administrative and military education. He made a name for himself with his courage, heroism and benevolence who had been with his fatherMurad I in all wars. Both he and his brother Bayezid I showed great benefits in the Battle of Kosovo, the last expedition of their father Murad I. In the war, Yakub Çelebi left the left flank and was subjected to the intense attack by Serbian princeLazar. With the Serbian army in a bad position, Yakub pursued them. While this was happening, Murad I, walking around the battlefield, was killed by a dagger by an injured and captured Serb named Miloš Obilić. The throne was given to Bayezid with the agreement of the pashas.
Death and legacy
In the Ottoman Empire, there was no established heritage system for the crown and to prevent a possible civil war between himself and Yakub, Bayezid decided to murder his brother. Yakub, on the order of his brother Bayezid, is strangled and killed. The rebellion and murder of his son, Savcı Bey, who had taken a look at the throne of Murad I, was likely to have made this decision. Bayezid brought his brother's body to Bursa and buried it in a ceremony. There is no inscription about the tomb located in the northwest of the Yakub Çelebi Mosque in Iznik. The tomb of Yakub was buried in the Hüdavendigar Tomb in Bursa. Yakub Çelebi has a mosque in Iznik, a tomb and a bath in Keles. This tomb is numbered XIV and it was built towards the end of the century. It has a square plan and there are knitted feet at the corners of the tomb and they are connected to each other with pointed arches. Legs and arches are built with a single row of cut stones and three rows of bricks. A pendant dome based on these covers the tomb. The west of the tomb was later covered with yarn. Yakub Çelebi's Story, which has an important place in Medieval Catalan literature, is about the adventures of Yakub Çelebi and his murder by Bayezid in the Battle of Kosovo. In the 1989 Yugoslav historical dramaBattle of Kosovo, Çelebi is portrayed by Marko Baćović.
