sentences:  The town is referred to as New Castle in the "Annals of the Four Masters" in 1433, so it is likely that he built on the site of an existing structure.In the 17th century Ulster ports began to rise in prominence.In 1625 William Pitt was appointed as Customer of the ports of Newcastle, Dundrum, Killough, Portaferry, Donaghadee, Bangor and Holywood.