sentences:  The latter were later called Picts or Caledonians by the Romans.Greek historians Diodorus of Sicily and Strabo preserved variants of "Prettanike" from the work of Greek explorer Pytheas of Massalia, who travelled from his home in Hellenistic southern Gaul to Britain in the 4th century BC.The term used by Pytheas may derive from a Celtic word meaning "the painted ones" or "the tattooed folk" in reference to body decorations.