He was the son of his predecessor William, Lord of Coucy, Marle, Fère, Oisy and Mount-Mirel, who held the titles from 1321–1335.
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He was also Lord Gynes, Sire d' Oisy, in the district of Marle, and the Sire de La Fère.
Eliott was educated at the University of Leiden in the Dutch Republic and studied artillery and other military subjects at the école militaire of La Fère in France.
He died in the French camp at La Fère on 23 March 1596, a collection of Latin verses being published in his memory at Oxford later in the year.
He became a sergeant in the 1st Arsenal battalion and in 1793 moved to the artillery at La Fère, assisting in the sieges of Landrecies, Le Quesnoy and Valenciennes.
Only the statue of the Zouave was retained: the Skirmisher was relocated to the Gravelle Stronghold in Vincennes, the Grenadier to Dijon, and the Artilleryman to La Fère.
The son, after spending some time in a pharmacy at La Fère acted as laboratory assistant to Gay-Lussac and Jean Louis Lassaigne at Paris from 1827 to 1829.
La Fère | Fère-en-Tardenois | Fère | Battle of Fère-Champenoise | Villeneuve-sur-Fère | Powder chamber of a ''Veuglaire'', caliber 130 mm, length 1.07 m, wrought iron, early 15th century, La Fère | La Fere | Canton of La Fère | battle of Fère-Champenoise |
Best results: 1st at Alushta 2004; 1st at Kireyevsk 2004; 2nd at Tula 2006; 1st at Konya 2006; 1st the Rohde Open in Sautron, France 2007; 1st at Canakkale 2007; 1st at La Fere Open (France) 2008; 1st at Nimes Open (France) 2008; 2nd at the President's Cup in Baku 2008; 1st at the Caspian Cup in Rasht 2010.
From 1780 to 1790, his early military career as an engineer was passed at La Fère and Brest before he was posted overseas to Martinique, Guadeloupe and the Islands of Tobago.
He also gained the titles of 4th Lord Gynes: Sire d' Oisy, in the district of Marle and the Sire de La Fère.