 Their marriage alliance with the Ros (or Roos) family enhanced the Parr family standing.On the accession of the Duke of Lancaster as Henry IV of England, Sir William senior stood so high in the estimation of the new monarch that he was deputed with the bishop of St. Asaph to announce the revolution to the court of Spain.Through his marriage William acquired, by right of his wife, a fourth part of the manor of Kirby in Kendal, Kendal Castle, and one-fourth part of the barony of Kendal, which continued in the family till after the death of his grandson, William Parr, 1st Marquess of Northampton, when the Marquess's widow surrendered it to Queen Elizabeth I.