 The familiar literary persona of Arthur began with Geoffrey of Monmouth's pseudo-historical "Historia Regum Britanniae" ("History of the Kings of Britain"), written in the 1130s.The textual sources for Arthur are usually divided into those written before Geoffrey's "Historia" (known as pre-Galfridian texts, from the Latin form of Geoffrey, "Galfridus") and those written afterwards, which could not avoid his influence (Galfridian, or post-Galfridian, texts).The earliest literary references to Arthur come from Welsh and Breton sources.