From Wikipedia, the free encyclopedia.
Robert Stewart (1739-1821) was the father of the famous politician Lord Castlereagh.
He was regularly promoted through the ranks of the peerage of Ireland:
- Baron Londonderry (1789)
- Viscount Castlereagh (1795)
- Earl of Londonderry (1796) - on reaching this rank, his son took Viscount Castlereagh as a courtesy title.
- Marquess of Londonderry (1816)
New Creation |width="40%" align="center"|Marquess of Londonderry |width="30%" align="center"|Followed by:
Robert Stewart |}
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