I find, on consultation of the Allonby records, that Sylvia Vernon died of a quinsy, in 1419, surviving Sir Robert by some three months. She had borne him four sons and four daughters: of these there remained at Winstead in 1422 only Sir Hugh Vernon, the oldest son, knighted by Henry V at Agincourt, where Vernon had fought with distinction; and Adelais Vernon, the youngest daughter, with whom the following has to do.