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John de Havilland’s interest in heraldry and armorial bearings is shown in 1865 when he updated Thomas Fiott de Havilland’s 1852 book “A Chronicle of the Ancient and Noble Norman Family of de Havilland”.John de Havilland’s updated edition gives considerable detail to the lives of his own parents and grandparents with their heraldic coats of arms displayed in the margins.John de Havilland explains that his maternal grandfather, William Ludwig von Sonntag, was born in Pforzheim (modern South West Germany) in 1745.