 Some Muslim historians believe the site of the Battle of Ajnadayn between the Muslim Arabs and the Byzantines in 634 CE was at Lajjun . Following the Muslim victory , Lajjun , along with most of Palestine , and southern Syria were incorporated into the Caliphate . According to medieval geographers <unk> and Ibn Hawqal , Lajjun was the northernmost town of Jund Filastin ( military district of Palestine ) . 
