Thus the First Bulgarian Empire came to an end in 1018, only four years after Samuel's death. Most of its territory was incorporated within the new Theme of Bulgaria, with Skopje as its capital. In the extreme northwest, the duke of Syrmia, Sermon, was the last remnant of the once mighty Empire. He was deceived and killed by the Byzantines in 1019. Samuel's wife was called Agatha, and was the daughter of the magnate of Dyrrhachium John Chryselios. Only two of Samuel's and Agatha's children are definitely known by name: Samuel's heir Gavril Radomir and Miroslava. Two further, unnamed daughters, are mentioned after the Bulgarian surrender in 1018, while Samuel is also recorded as having had a bastard son. Another woman, Kosara, who was wedded to Jovan Vladimir of Duklja and was considered by earlier scholarship as Samuel's daughter, is now regarded to have been simply a relative, perhaps a niece of Agatha. Gavril Radomir married twice, to Ilona of Hungary and Irene from Larissa. Miroslava married the captured Byzantine noble Ashot Taronites. After the fall of Bulgaria, Samuel's descendants assumed important positions in the Byzantine court after they were resettled and given lands in Asia Minor and Armenia. One of his granddaughters, Catherine, became empress of Byzantium. Another (supposed) grandchild, Peter II Delyan, led an attempt to restore the Bulgarian Empire after a major uprising in 10401041. Two other women of the dynasty became Byzantine empresses, while many nobles served in the army as strategos or became governors of various provinces. There is also another version about Samuel's origin. The 11th-century historian Stepanos Asoghik wrote that Samuel had only one brother, stating they were both Armenians from the district of Derjan, an Armenian land incorporated into the Byzantine Empire. They were sent to fight the Bulgarians in Macedonia but ended up joining them. This version is supported by the historian Nicholas Adontz, who analyzed the events and facts of the century and concluded that Samuel had only one brother, David. Asoghik's version is also supported by the historian Jordan Ivanov; furthermore, only one brother is mentioned on Samuel's Inscription. The Arab historian Yahya of Antioch claims that the son of Samuel, Gavril, was assassinated by the leader of the Bulgarians, son of Aaron, because Aaron belonged to the race that reigned over Bulgaria.