The right to vote was vested theoretically in the Mayor, aldermen and those freemen of the borough who were resident at the time they became freemen; but in practice the vote was exercised only by members of the corporation, who were chosen mainly with a view to maintaining the influence of the "patron". Up to 1775, this was generally the head of the Morice family, who also controlled Newport, but in that year Humphry Morice sold his interest in both boroughs to the Duke of Newcastle, whose family retained hold on both until the Reform Act. There were about 17 voters in Launceston in 1831, by which time the borough was as rotten as any of the others in Cornwall.