[1] Martyn was called to the bar at the Middle Temple in 1589, and from 1605 to 1617 held the office of recorder of Exeter.
[1] Martyn was the author of The Historie and Lives of the Kings of England from William the Conqveror vnto the end of the Raigne of Henrie the Eight, 1615, containing preliminary verses from his three sons and his son-in-law, and an appendix of "succession of dukes and earles" and other particulars.
VI, Queene Mary, and Q. Elizabeth, by B. R., Mr of Arts, longer than all the rest of the lives put together.
Martyn married for his second wife Jane, daughter of Henry Huishe of Sands in Sidbury, Devon.
The eldest son Nicholas Martyn succeeded to his father's estate of Oxton in Kenton.