Tregar Dragen is an unseen character in Game of Thrones. He is deceased when the series begins. He was a Lord of Snake Mount and head of House Dragen.
Tregar was the first born son of Lord Veron Dragen and his wife Dolyse Berrow. His birth marked the alliance between House Dragen and House Berrow. He had three brothers.
After Veron's death he became the new lord of Snake Mount.