Davelis was born and raised in Livadia, Kilkis in the 1880s. His family was well known for their national war participations which dates back to 1821. He formed and led an armed group. He collaborated with his fellow soldiers Stergios Naoum, Anastasios Bellis Kulina and Nikolaos Nessios. He also worked with Konstantinos Garefis several times. In 1906, in the "Battle of Valia Siaca", between Livadia and Ossiani (nowadays Archangel), he was arrested with other Macedonomachoi by the Ottoman authorities and imprisoned in Heptapyrgion of Thessaloniki. In 1908, with the revolution of the Young Turks, a general amnesty was granted and in result he got liberated.