What is "triantafyllos"

Triantafyllos (ca. 1665 – August 8, 1680) is a martyr of the Greek Orthodox Church. He was born in Volos, in then Ottoman-controlled Greece, and was taken captive by the Turks one day while he was working as a fisherman. He was tortured when he refused to renounce his Christian faith and convert to Islam and was eventually killed by his captors.