Sahdona was born around 600 AD in the village of Halmon near Beth Nuhadra north of Nineveh.
He joined the Beth Abe Monastery at his youth and took part in a delegation headed by the Catholicos Ishoyahb II to seek peace with the Byzantine Empire after the Sasanian defeat in a recent war.
Sahdona accepted and after the second debate declared his conversion to the West Syriac Church.
He later returned to the Church of the East but was excommunicated by Ishoyahb II so he stayed for the rest of his life in Edessa where he died around 649 AD.
[1] Sahdona authored the voluminous "Book of Perfection" while a monk in Beth Abe and is considered the most significant work of East Syriac monasticism.