He succeeded to the Baronetage of Merrion Square in 1884 on the death of Sir Joseph Napier, 2nd Baronet (1841–1884), and was succeeded by Sir Joseph William Lennox Napier, 4th Baronet (1895–1986).
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Lt Col Sir William Lennox Napier, 3rd Baronet of Merrion Square, (12 October 1867 – 13 August 1915), was a British baronet and soldier.
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partly 15th century, largely rebuilt c. 1760; it was the home of the historian Sir William Napier between 1826 and 1831.