Catherby is the spare account of Kire667, the leader of the clan Catherby. He placed the name on that account to reserve it for clan use, such as a Friends Chat, and so no enemies of the clan could claim the name.
On Runescape 3, Catherby has a total level of over 1600, and a combat level of 30+. He has three levels at 99: Fishing, Runecrafting, and Firemaking.
On Old School Runescape, the account currently has over 135 million fishing experience, and is ranked 179th for that skill.