Reginald Lawrence Knowles was an English film actor who renamed himself Patric Knowles, a name which reflects his Irish descent. He appeared in films of the 1930s through the 1970s. He made his film debut in 1933, and played either first or second film leads throughout his career.
In his first American film, Give Me Your Heart, released in Great Britain as Sweet Aloes, Knowles was cast as a titled Englishman of means.
While making The Charge of the Light Brigade at Lone Pine, California, he befriended Errol Flynn, whose acquaintance he had made when both were under contract to Warner Bros. in England. Since that film, in which Knowles played the part of Capt. Perry Vickers, the brother of Flynn's Maj. Geoffrey Vickers, he was cast more frequently as straitlaced characters alongside Flynn's flamboyant ones, notably as Will Scarlet in The Adventures of Robin Hood. Both actors starred as well in Four's A Crowd, also in 1938.
More than two decades after Flynn's death, biographer Charles Higham sullied Flynn's memory by accusing him of having been a fascist sympathizer and Nazi spy. Knowles, who had served in World War II as a flying instructor in the RCAF, came to Flynn's defense, writing Rebuttal for a Friend as an epilogue to Tony Thomas' Errol Flynn: The Spy Who Never Was ISBN 080651180X.