The Tory Leader of the House of Commons until 1822, when he committed suicide, was Robert Stewart, Viscount Castlereagh who inherited his father's Irish peerage and became the 2nd Marquess of Londonderry in 1821.
The Tory Leader of the House of Commons until 1822 was Robert Stewart. Robert Stewart was Viscount Castlereagh. This Viscount Castlereagh inherited his father's Irish peerage. This Viscount Castlereagh became the 2nd Marquess of Londonderry in 1821. He committed suicide.