Sillem was educated at Haileybury and Magdalen College, Oxford, and received the habit at the Benedictine abbey of St Gregory, Downside, in 1929.
The son of George Morgan Trefgarne, 1st Baron Trefgarne, Trefgarne succeeded his father as 2nd Baron Trefgarne in 1960 at the age of 19, having attended Haileybury and Imperial Service College.
Haileybury and Imperial Service College, a coeducational English independent school in Hertfordshire
New buildings for Haileybury College (now called Haileybury and Imperial Service College)
He was one of five brothers from North Berwick, Scotland, three of whom were killed in the war and one died at Haileybury.
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The family was from Ireland and Clement grew up in Delgany, although he went to school at Haileybury before attending Trinity College, Dublin.
Apart from his careers in the Army and at court he was also a Fellow of the Royal Geographical Society and of the Zoological Society of London, President of Westminster Hospital and Governor of Wellington College and Haileybury.
Educated at Haileybury and at Trinity College, Cambridge, he joined the Indian Civil Service in 1927 and served in Punjab, Rajputana, Kathiawar, Baluchistan, Central India, Tibet and the Persian Gulf.
It was founded in 2011 as offshoot from Haileybury, an independent school in England.