Gregor was the husband of Jaden Muirden and the father of Edwin Muirden. He and his wife were sorcerers who followed the ways of the Old Religion and taught their son the use of magic. They were also friends with Gaius. When the Queen died in childbirth, King Uther began to prosecute all forms all magic and executed everyone that he caught practicing it. Gregor and Jaden suffered this fate and were sentenced to be burned at the stake. While they were being burned, Edwin tried to save his parents, but failed and was permanently scarred by the flames. Many years later, Edwin returned to Camelot to avenge his parents death by killing Uther, but he failed to so and was later killed by Merlin. According to Gaius, Gregor and Jaden started to practise dark magic around the time of the Great Purge, but it is unknown whether they were evil or not (A Remedy to Cure All Ills).