The Holy Hieromartyr Gregory was from Thebes in Boetia and later served as Metropolitan of New Patras. One day, as he serving the Divine Liturgy in the Metropolitan Cathedral Church of Saint Nicholas in Ypatis on the eve of the Akathis Hymn, certain Turks came in and slaughtered him before the Holy Altar as he held the Holy Chalice in his hands, in the presence of a number of Christians from the villages. This took place in 1711.
Though he is not commemorated in the synaxaria of the Church and is virtually unknown, he is commemorated in the Metropolis of Fthiotida on the Sunday that falls between the 18th and the 24th of March, on which day all the saints of Fthiotida are celebrated. There is a chapel dedicated to the Holy Hieromartyr Gregory in the basement of the Church of Saint Paraskevi in Lamia, which was inaugurated by Metropolitan Nicholas on April 4, 2009.
See also: Synaxis of All Saints of Fthiotidos