brut y brenhinedd ("chronicle of the kings") is a collection of variant middle welsh versions of geoffrey of monmouth's latin "historia regum britanniae". about 60 versions survive, with the earliest dating to the mid-13th century. adaptations of geoffrey's "historia" were extremely popular throughout western europe during the middle ages, but the "brut" proved especially influential in medieval wales, where it was largely regarded as an accurate account of the early history of the celtic britons.