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Later life and death
Thomas Newenham Deane married a Blackrock neighbor Henrietta, the fourth daughter of Joseph Manly of Ferney, County Cork, and his wife Deborah (née Newenham) on 29 January 1850. Together they had one daughter and seven sons, one of them being Thomas Manly Deane (8 June 1851 – 3 February 1933) who later joined his father in his architecture practice. Deane, his wife and sons, Thomas Manly and Joseph Henry (b. 1853) moved into a house in Dublin, on Upper Merrion St. in early 1854. In his later life, Thomas Newenham Deane got recognition as an antiquary. He was appointed to the part-time government post of superintendent of national monuments in 1875. In 1878, Deane’s other son, Thomas Manly Deane, joined his practice.

Deane with his son won a competition for two buildings in 1884; National Library and National Museum on Kildare St. This led to Deane’s knighting in 1890 by the lord-lieutenant, the marquess of Zetland. Especially in his later life, Deane showed a lot of interest in the movement for the preservation of the national monuments and ancient monuments of Ireland. In the passing of the Ancient Monuments Protection Acts of 1882 and 1892, Deane was therefore appointed to the post of inspector of national and ancient monuments. This post kept Deane busy in his later years.

Thomas Newenham Deane had just moved into his new office on St Stephen's Green, when he suddenly died on 8 November 1899 in this office. He was buried in Deans Grange Cemetery. His son, Thomas Manly, designed and build a cross in his memory. Widowed Lady Deane died on 27 February 1911. Deane was known to be a joyful man and was very popular in Dublin. During his life, he was a member of the Royal Hibernian Academy and the Royal Institute of Architects of Ireland.