 The exclusion of other hereditary peers removed Charles, Prince of Wales (who is also Earl of Chester) and all other Royal Peers, including Prince Philip, Duke of Edinburgh; Prince Andrew, Duke of York; Prince Edward, Earl of Wessex; Prince Richard, Duke of Gloucester; and Prince Edward, Duke of Kent.The number of hereditary peers to be chosen by a political group reflects the proportion of hereditary peers that belonged to that group (see current composition below) in 1999.When an elected hereditary peer dies, a by-election is held, with a variant of the Alternative Vote system being used.