anchor argent armiger armorial of plantagenet attributed arms blazon bordure buckle canting arms clarichord coat of arms coat of arms of portugal crescent cross moline ecclesiastical heraldry edward ii of england family gules harp heraldic badge heraldic flag heraldry heraldry society infante isabella of france john writhe law of arms mantling martlet officer of arms peter gwynn-jones prince william of wales prince of wales quatrefoil saint george scallop scottish clan snowflake supporters vexillology