Trivia

He has Norse-Gaelic roots and is a descendant of the Hiberno-Norse King Óttar of Dublin, a prominent figure who ruled from 1142 to 1148 during a brief resurgence of Norse influence in the city amid ongoing struggles with Irish dynasties and rival Norse claimants.

In one of his first acting jobs, he worked with Robert De Niro.

Cotter's father was Sir Patrick Cotter, the 7th Baronet of Rockforest.

In 2023 Cotter succeeded his father as the 8th Baronet of Rockforest, County Cork.

He was born in Dublin, Ireland.

He was educated at Allhallows College and the University of East London.

Originally planned to pursue a profession in the art world after graduating from the University of East London, before becoming interested in acting.

Speaks fluent Castillian Spanish.