Trial and Martyrdom
According to the sources, Barlaam was arrested during Diocletian's persecution and brought to trial — placed by some accounts around the year 304 — where he confessed himself a Christian and refused the order to sacrifice to idols. The authorities subjected him to a sequence of tortures, including flogging with a cowhide, the removal of his fingernails, scourging, and racking.
The central episode of his passion was a calculated deception by his judges. They forced his right hand open over a pagan altar and placed in his palm burning coals together with incense (frankincense), intending that the searing pain would make him involuntarily drop the materials onto the altar — which would have been counted as an act of sacrifice to the idol. Barlaam neither flinched nor let the burning materials fall. The accounts relate that he held his hand steady until the fire had wholly consumed it, after which he gave up his soul to the Lord.
The OCA synaxarion places his suffering in Antioch of Syria; some Western accounts instead record his death at Caesarea in Cappadocia. He is titled 'of Caesarea' in the commemoration used here.