William James Sibree Tudor is an English actor, known for his role as Olyvar in the HBO series Game of Thrones from 2013 to 2015. He has also appeared in the miniseries The Red Tent, and the Channel 4 series Humans. From 2017 to 2018, he portrayed Sebastian Verlac / Jonathan Morgenstern on the Freeform series Shadowhunters. From Wikipedia
