Background
On 5 May 1794, he married Lady Helena, the daughter of Stephen Moore, 1st Earl Mount Cashell.
On 5 May 1794, he married Lady Helena, the daughter of Stephen Moore, 1st Earl Mount Cashell.
They had six children:
Lady Helena King (11 August 1793 – 20 November 1853), married Philip Davies-Cooke on 8 December 1829
Edward King, Viscount Kingsborough (1795–1837)
Robert King, 4th Earl of Kingston (1796–1867)
Honorary George King (20 August 1798 – 2 May 1801)
James King, 5th Earl of Kingston (1800–1869)
Lady Adelaide Charlotte King (died August 1854), married Charles Tankerville Webber (died March 1854), son of Daniel Webb Webber, on 2 August 1834
He was created Baron Kingston in the Peerage of the United Kingdom in 1821.
He was returned as a Member of the Parliament of Ireland for County Roscommon in 1798, vacating the seat in the following year when he succeeded his father as Earl of Kingston.