Passage: English folklore developed over many centuries. Some of the characters and stories are present across England, but most belong to specific regions. Common folkloric beings include pixies, giants, elves, bogeymen, trolls, goblins and dwarves. While many legends and folk-customs are thought to be ancient, for instance the tales featuring Offa of Angel and Wayland the Smith, others date from after the Norman invasion; Robin Hood and his Merry Men of Sherwood and their battles with the Sheriff of Nottingham being, perhaps, the best known.During the High Middle Ages tales originating from Brythonic traditions entered English folklore and developed into the Arthurian myth. These were derived from Anglo-Norman, Welsh and French sources, featuring King Arthur, Camelot, Excalibur, Merlin and the Knights of the Round Table such as Lancelot. These stories are most centrally brought together within Geoffrey of Monmouth's Historia Regum Britanniae (History of the Kings of Britain). Another early figure from British tradition, King Cole, may have been based on a real figure from Sub-Roman Britain. Many of the tales and pseudo-histories make up part of the wider Matter of Britain, a collection of shared British folklore.

Question: Over what time period was English folkore created?
centuries