1. | Robert (1st Marquess of Londonderry) Stewart was born on 27 Sep 1739; died on 8 Apr 1821 in Baron Londondery, Viscount Castlereagh, Earl Londonderry. Robert married Sarah Frances Seymour on 3 Jun 1766. Sarah (daughter of Francis (1st Marquess of Hertford) Seymour-Conway and Isabella FitzRoy) died on 18 Jul 1770. [Group Sheet] [Family Chart] Children:
Robert married Frances Pratt on 7 Jun 1775. Frances (daughter of Charles (1st Earl of Camden) Pratt and Elizabeth Jeffreys) died on 18 Jan 1833. [Group Sheet] [Family Chart] Children:
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