Jund Filastin
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 Estakhri and Ibn Hawqal, Lajjun was the northernmost town of Jund Filastin (military district of Palestine).