Crest: A dexter arm embowed, sleeved Sable, holding a heart, Proper
Motto: Alta Pete (Aim high)
Clan Chief: None, armigerous family
Glen/Glenn is accepted as a sept of Clan Douglas.
The most likely reason for this surname’s inclusion as a Sept of Douglas is that it could be (arguably) a shortened form of Glenndinning.
Glen/Glenn is also seen as a sept of Clan MacKintosh