Isaac Newton Wallop, 5th Earl Of Portsmouth

Isaac Newton Wallop, the 5th Earl of Portsmouth, was born on January 11, 1825, and died on October 4, 1891. He was a British peer and the son of Newton Fellowes, the 4th Earl of Portsmouth, and Lady Catharine Fortescue. Upon succeeding to the peerage in 1854, he resumed the family surname and arms of Wallop, having been born as Isaac Newton Fellowes.

His early education took place at Rugby School, after which he matriculated at Trinity College, Cambridge. At Cambridge, he earned a Master of Arts degree.

In 1872, Lord Portsmouth donated a significant collection of papers by Sir Isaac Newton to Trinity College, Cambridge. These papers had descended through Newton’s great-niece, Catherine Conduitt, daughter of John Conduitt and Catherine Barton, into the Wallop family via her marriage to John Wallop, Viscount Lymington. A university committee led by John Couch Adams and Sir George Stokes reviewed the collection, selecting only Newton’s scientific papers for preservation while returning the remainder to Lord Portsmouth. After approximately sixteen years of cataloging, Cambridge retained a small selection of Newton’s papers, while others were auctioned in 1936 by the 9th Earl of Portsmouth.

On February 15, 1855, Lord Portsmouth married Lady Eveline Alicia Juliana Herbert, born December 21, 1834, and deceased October 1, 1906. She was the daughter of Henry John George Herbert, the 3rd Earl of Carnarvon, and Henrietta Anna Howard. They produced twelve children:

- Lady Rosamond Alicia Wallop (d. 1935), married Augustus Langham Christie and had issue.

- Lady Eveline Camilla Wallop (d. 1894), married William Brampton Gurdon MP, died without issue.

- Lady Catherine Henrietta Wallop (d. 1935), married Charles Milnes Gaskell and had issue.

- Lady Dorothea Hester Bluett Wallop (d. 1906), married Sir Richard Rycroft, 5th Baronet, and had issue.

- Lady Gwendolen Margaret Wallop (d. 1943), married Vernon James Watney, had issue, and was the grandmother of Charles Lyell, 2nd Baron Lyell.

- Lady Henrietta Anna Wallop (d. 1932), married John Carbery Evans, died without issue.

- Newton Wallop, the 6th Earl of Portsmouth (1856–1917), married Beatrice Mary Pease, died without issue.

- John Fellowes Wallop, the 7th Earl of Portsmouth (1859–1925), died unmarried.

- Oliver Henry Wallop, the 8th Earl of Portsmouth (1861–1943), married Marguerite Walker and had issue.

- Gerard Vernon Wallop, the 9th Earl of Portsmouth.

- Hon. Oliver Malcolm Wallop, and several other children with limited available information.

Lord Portsmouth declined the elevation of his title to a marquessate and refused an offer to become a Knight of the Garter from Prime Minister William Ewart Gladstone, considering such honors beyond his merits.

He died at the age of 66 on October 4, 1891. His successor in the earldom was his son, Newton Wallop, the 6th Earl of Portsmouth.