Googling aroud I discovered that the old church at Vili-Robau dates from the 10th Century and Robau is derived from a German word ‘Hrotbaldi’ or ‘Rodebalb’. The name might date back to the Visigoths a Germanic tribe who ruled the Iberian penninsula from the5th to the 7th Century. Many place and family names in Iberia have Visogothic origins.