Hierophant Gyleon is the high priest at the Cathedral of the Dawning Sun in Scandshar.

A stern, older man, Hierophant Gyleon met the Shields of the Sorrowfell when they left Aldric Teuber, Durnhelm Teuber, Engelbrecht Veit, Father Heinfried Ohrsten, “Mad Dog” Eddie, and Mike Dyer with him while investigating the ruins of Aalsburg Castle.

Image retrieved from https://tolas.fandom.com/wiki/Church_of_Truth on February 28, 2020.