Justin Martyr was an early Christian apologist and philosopher. Most of his works are lost, but two apologies and a dialogue did survive.
Theophilus was Patriarch of Antioch from 169 until 182. He succeeded Eros c. 169 AD and was succeeded by Maximus I c. 183 AD. His death probably occurred about 182. He is included among the dozen or so Christian apologists of his day.