 This had been noted by Tacitus, for example when he mentioned the names of two kings of the 1st century Frisians and added that they were kings "as far as the Germans are under kings".Haywood ("Dark Age Naval Power", 1999) says the Chauci were originally neither highly centralised nor highly stratified, though they became more so after 100 AD.Yorke ("The Conversion of Britain c.600–800", 2006), speaking of the 5th century, describes the 'Continental Saxons' (which then included the Chauci) as having powerful local families and a dominant military leader.