The town grew around the bridge built by William Marshal, son-in-law of Richard de Clare, 2nd Earl of Pembroke (Strongbow), and a leader of the Norman invasion of Ireland. The town of New Ross (the town of the new bridge) was granted a Royal Charter in 1207. The port gained concessions from King John in 1215 and again in 1227 but these were later revoked by Henry III and Edward I to protect the port of Waterford. New Ross was still Ireland's busiest port in the 13th century. These restrictions were lifted in the 14th century by Edward II and Edward III.