Caernarvon Boroughs
No estimates of the total electorate in this constituency survive, but there were 60 freemen in the principal borough in 1685, and it is reasonable to suppose that none of the four contributory boroughs exceeded this figure. The charter of 1284 provided that the constable of Caernarvon Castle, who was appointed by the crown, should also act as mayor during his term of office. Since he seems to have functioned as returning officer, this gave a potential interest to the Robartes family, constables from 1663 to 1713.