john mor macdonald 1st of dunnyveg married margery bissett of the glens of antrim, and acquired as a result the castle of red bay. his descendants known as the macdonnells of antrim extended and rebuilt the castle in the 16th century. in 1565, the castle was burned to the ground by shane o'neill, chief of the o'neills of tyrone; it was rebuilt by sorley boy macdonnell, however later fell into disrepair.