Arddr (Arddau) Lewis Topographical Dictionary of Wales 1845

Arddr (Arddau), a hamlet, in the parish of Llanbedr, hundred of Llêchwedd Isâv, county of Carnarvon, North Wales, 4 miles (N. by W). from Llanrwst; containing, with the hamlet of Dôl-y-Garog, 144 inhabitants.

Source: A Topographical Dictionary of Wales by Samuel Lewis Third Edition Published London; by S. Lewis and Co., 13, Finsbury Place, South. M. DCCC. XLV.