Lord Cloncurry died at Maretimo, Blackrock, County Dublin, in August 1799, aged 63, and was succeeded in his titles by his son, Valentine.
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Another daughter, the Honourable Valentina Letitia Lawless, married Sir Francis Conyngham.
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He is believed to have joined the United Irishmen in 1793, shortly before his father Nicholas Lawless, a wool-merchant turned banker who converted from Catholicism to the Church of Ireland and became the first Lord Cloncurry, took charge of Lyons House.