It is possible that there were two names used for the Serbs in this period. A general one, depicting the descendants of the first settlers while the other was a regional one. By the 11th century, most of the regional names disappeared and were replaced by the ethnonym Serbs. In his work "Strategikon of Kekaumenos", the 11th century Byzantine general Katakalon Kekaumenos refers to the duke of Duklja Stefan Vojislav as both "Dioclean" and "Travunian Serbian". John Skylitzes, a historian from the same period, calls Stefan Vojislav an "archon of the Serbs" and that he took over the "land of the Serbs".