Mary Petre (died 1640) (1600–1640) Parents William Petre, 2nd Baron Petre Lady Katherine Somerset Children Elizabeth Roper unknown Roper unknown daughter Roper Christopher Roper, 4th Baron Teynham unknown Roper unknown daughter Roper unknown daughter Roper Siblings Robert Petre, 3rd Baron Petre John Petre Elisabeth Petre William Petre Catherine Petre Partners John Roper, 3rd Baron Teynham