Background
He was the younger son of George Tennyson, who bought the family seat of Beacons, in the village of Tealby, Lincolnshire, along with 2,000 acres (8 km²) of land, and came in time to own a large part of the village.
politician Member of Parliament in the United Kingdom
He was the younger son of George Tennyson, who bought the family seat of Beacons, in the village of Tealby, Lincolnshire, along with 2,000 acres (8 km²) of land, and came in time to own a large part of the village.
He was educated at St John's College, Cambridge.
As a result there was bad blood between the penurious Tennysons of Somersby, where George Clayton Tennyson had the living until he succumbed to drink and depression, and the opulent Tennysons of Beacons, who fancied themselves not only the wealthy but the socially superior side of the family. Old George’s wife Elizabeth Clayton was supposed to have descended from the Lords of Lovel and d’Eyncourt, and also from King Edward III. A ruined castle was part of the property, and Charles wished to establish a noble lineage for himself with a title and a castle. When his father died he changed his family’s name to Tennyson d'Eyncourt.
Beacons was renamed Bayons, to make it sound like a Norman castle, and it was extensively enlarged and rebuilt in the style of a Gothic castellated manor-house. In public life Charles Tennyson d'Eyncourt was for many years MP for Lambeth, and was made a Privy Counsellor in 1832. Also in the 1830s, along with Augustus, Duke of Sussex and Admiral Sir Sidney Smith, he was one of the prime movers in a plan to have the Order of Knights Templar revived as a British order of chivalry.
In this he failed, and he also failed during 1839-41 in an attempt to revive the d'Eyncourt peerage for himself and his heirs. In February 1829 he was elected a Fellow of the Royal Society
He did not live long enough to have to endure a 'Somersby Tennyson' being elevated to the peerage. The Tennyson d'Eyncourt family eventually gained its baronetcy at the beginning of the 20th century and still continues.
Two of its later members had notable maritime roles. Charles's second son Edwin Tennyson d’Eyncourt (1813–1903) entered the Royal Navy and became an Admiral.
[Royal Society; 6th United Kingdom Parliament. 7th United Kingdom Parliament. 8th United Kingdom Parliament.
9th United Kingdom Parliament. 10th United Kingdom Parliament. 11th United Kingdom Parliament.
12th United Kingdom Parliament. 13th United Kingdom Parliament. 14th United Kingdom Parliament.
15th United Kingdom Parliament]
Undoubtedly the most significant member of the family was the naval architect Sir Eustace Tennyson d'Eyncourt (1868–1951), the First Baronet, who was the Royal Navy's Director of Naval Construction in the first decades of the 20th century.