 The exact origin of early Iapydes is uncertain; archaeological documentation suggests mixed affinities to early "Pannonii" and Illyrians.The first written mention of an Illyrian tribe is from Greek writers from the 6th century BC.They are provisionally described by Strabo as a mixed race of Celts and Illyrians, who used Celtic weapons, tattooed themselves, and lived chiefly on spelt and millet; however, Strabo's suggestion of a mixed Celtic-Illyrian Iapydes culture is not confirmed by archaeology.