Descendancy

John de St. John: B: about 1260.
    + Isabel de Courtenay: B: about 1283.
        2 Margaret de St. John: B: about 1304.
            + John Mandeville-Beauchamp: B: 1306. D: 1343
                3 Cecily Mandeville-Beauchamp: B: about 1330. D: 1394
                    + Roger Seymour
                        4 William Seymour: B: about 1340. D: 1391
                            + Margaret de Brockbury
                                5 Roger Seymour: B: about 1366.
                                        6 John Seymour: B: about 1400. D: 1464
                                            + Isabel MacWilliam

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