sentences:  Gwilym joined the Royal Shakespeare Company in 1974; his debut in London was with that company in that year as 'Vlass' in "Summerfolk", at the Aldwych Theatre.He starred in many of their productions during the late 1970s and early 1980s, including "The Comedy of Errors", "King Lear", "Troilus and Cressida", and "Love's Labour's Lost".He made his television debut in the BBC's 1975 adaptation of "How Green Was My Valley".