He owned Dyffryn House in Glamorgan, among other properties, but in 1939 he leased it to the local authority. After distinguished service in World War II, he went into politics, but failed to be elected as an MP. He was a Knight of the Garter (1970) and was Lord Lieutenant of Glamorgan from 1952 until 1974 when, in a unique appointment for Wales, he became Lord Lieutenant of the three counties of South, Mid and West Glamorgan with a Lieutenant serving under him for each county. He eventually retired from the post in 1985.
- "Sir Cennydd Traherne, K.G., T.D., li.d., 1910-95". The Journal of Glamorgan History, Volume XXXIX 1995. Welsh Journals Online The National Library of Wales. 1995. Retrieved 2013-01-04.
- Llantrisant freemen
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