The Diocese of Eger was also set up around 1009. According to Thoroczkay, "it is very probable" that the bishopric's establishment was connected with the conversion of the Kabarsan ethnic group of Khazar origin and their chieftain. The head of the Kabarswho was either Samuel Aba or his father married Stephen's unnamed younger sister on this occasion. The Aba clan was the most powerful among the native families who joined Stephen and supported him in his efforts to establish a Christian monarchy. The reports by Anonymus, Simon of Kéza and other Hungarian chroniclers of the Bár-Kalán, Csák and other 13th-century noble families descending from Hungarian chieftains suggest that other native families were also involved in the process.