Tierent of Verditius
Tierent, of House Verditius, is or was a Magus of the 12th century currently only known for expanding the House Verditius Inner Mystery Bind Magical Creatures so that it could be used on Faerie Creatures as well as Magical Creatures. Since nothing else is known about him, it is possible he is still alive and may be a living contenious point between Houses Verditius and Merinita.
References
Tierent is currently only mentioned on pages 134-35 of Houses of Hermes: Mystery Cults.