Hans Frederic Rowan-Hamilton1 
Hans Frederic Rowan-Hamilton usually went by his middle name of Frederic.3 He was a secretary (to his father?) In 1928.3
- [S47] BIFR1976 page 554. See link for full details for this source. Hereinafter cited as. [S47]
- [S47] BIFR1976. [S47]
- [S4051] Ian Newman, “re: Rowan-Hamilton Family,” family provided evidence then verified by subsequent research and verification by BENR (101053), 28 October 2009. Hereinafter cited as “re: Rowan-Hamilton Family.”
Catherine Harriot Mona Rowan-Hamilton1 
Helen Ethelwyn Rowan-Hamilton1 
She was a nun.1
Sidney Augustus Rowan Rowan-Hamilton1 
He gained the rank of Lieutenant in the Royal Navy.1
Lt.-Col. Frederick Temple Rowan Rowan-Hamilton1 
He gained the rank of Lieutenant-Colonel in the l9th (East Norfolk) Regiment.1 He was Aide-de-Camp to the Lord-Lieutenant of Ireland (Lord Spencer.)1 He was Comptroller to Lord Dufferin in Canada and India.1
Child of Lt.-Col. Frederick Temple Rowan Rowan-Hamilton and Blanche Mary Fellowes-Gordon
- Brigadier Gawain Basil Rowan-Hamilton+2 b. 5 Jul 1884, d. 17 Jul 1947
Rear-Admiral William Abdy Fellowes-Gordon1 
He lived at Knockespoch, Aberdeenshire, ScotlandG.1
Children of Rear-Admiral William Abdy Fellowes-Gordon and Hannah Gordon
- Captain Henry Gordon Fellowes-Gordon2 b. 16 Oct 1858, d. 30 Dec 1925
- Blanche Mary Fellowes-Gordon+3 b. c 1862, d. 24 Jan 1960
Blanche Mary Fellowes-Gordon1 
From 26 April 1883, her married name became Rowan-Hamilton.
Child of Blanche Mary Fellowes-Gordon and Lt.-Col. Frederick Temple Rowan Rowan-Hamilton
- Brigadier Gawain Basil Rowan-Hamilton+2 b. 5 Jul 1884, d. 17 Jul 1947
Wilhelm Fürst von Nassau-Dillenburg1 
He gained the title of Fürst von Nassau-Dillenburg in 1701.
Karl Prinz von Nassau-Dillenburg1 
Phyllis Frances Blackburn1
From 5 October 1916, her married name became Rowan-Hamilton. She was with the First Aide Nursing Yeomanry and APM Military Police during the Second World War.1 She lived in 1976 at Tullymacnowes House, Toye, Killyleagh, County Down, IrelandG.1
Children of Phyllis Frances Blackburn and Brigadier Gawain Basil Rowan-Hamilton
- Lt.-Col. Angus David Rowan-Hamilton+2 b. 15 Nov 1919, d. 11 Apr 1978
- Lt.-Col. Denys Archibald Rowan-Hamilton+2 b. 26 Apr 1921, d. 10 May 2018
- Gawaine Leslie Rowan-Hamilton+2 b. 2 Apr 1923, d. 6 Feb 2014
