 According to these sources, the tomb of Galenus in Palermo was still well preserved in the tenth century.Nutton believes that ""On Theriac to Piso"" is genuine, that the Arabic sources are correct, and that the "Suda" has erroneously interpreted the 70 years of Galen's career in the Arabic tradition as referring to his whole lifespan.Boudon-Millot more or less concurs and favours a date of 216.