Tystiolaeth Garth Celyn - The Garth Celyn Evidence Prif amcan yr ysgrif yw dangos y gellir casglu peth o hanes a nodweddion topograffig y safle trwy ystyried yr enw Garth Celyn (llys Llywelyn ap Gruffydd). The main purpose of the present argument is to show that from a consideration of the name, some of the history and the topographical characteristics of the site (the court of Llywelyn ap Gruffydd) may be deduced. February 1997