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 collaborated with his fellow soldiers Stergios Naoum, Anastasios Bellis Kulina and Nikolaos Nessios.

In 1906, in the Battle of Valia Siaca, between Livadia and Ossiani (now Archangelos), 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 he was freed.