 It was notable for having returned three Prime Ministers as its members – Henry Pelham, who represented the town from 1717 to 1722, William Pitt the Elder from 1747 to 1754 and George Canning in 1827 – though only Canning was Prime Minister while representing Seaford.Seaford was a Cinque Port constituency, which was technically a separate category although in practice it was to all intents and purposes a parliamentary borough.The Cinque Ports were not under the jurisdiction of the counties in which they stood, and as a result were not represented in the earliest English parliaments because the boroughs were chosen by sheriffs from the towns within their counties.