Life and Martyrdom
Triandaphyllus came from Zagora of Magnesia, in Thessaly, a coastal district whose people lived largely from the sea; sources variously remember him as a sailor or a fisherman. He lived under Ottoman rule, the setting in which the New Martyrs of the post-Byzantine centuries gave their witness.
While at Constantinople he was pressed to deny Christ and accept Islam. He refused, professing himself an Orthodox Christian who would not deny his Saviour, and for this confession he was beheaded in 1680. The synaxarion records that he was about fifteen years old, though other accounts give a somewhat older age.
By the tradition preserved in the Greek sources, his execution took place in the Hippodrome of Constantinople.