|Birthday||May 24, 1948|
|Birth Place||Clydebank, West Dunbartonshire, Scotland, UK|
Cosmo is best known for playing older, veteran warriors in historical dramas and epics, such as Campbell in Braveheart, Glaucus in Troy, Hrothgar in The Last Legion and Hengist in the British TV series Merlin.
Although in his somewhat younger days he was also Angus MacLeod, cousin of the eponymous Highlander, saving the latter from a beating (or worse) when his immortality came to light.
He recently portrayed Lord Commander Jeor Mormont on the HBO hit series Game of Thrones.