Sir Constantine de Mortimer, Sr., of Attleborough, Knight

https://www.myheritage.com/names/constantine_mortimer

Sir Constantine De Mortimer, 1279 - 1359
Constantine De Mortimer was born in 1279, in Attleborough Manor, Wymondham, Norfolkshire, England, to William Mortimer and Alice Lady Attleborough Mortimer (born De Mortimer) .
William was born circa 1249, in Attleborough Manor, Wymondham, Norfolkshire, England.
Alice was born circa 1250, in Wayland Manor, Watton, Norfolkshire, England.
Constantine married Sibyl (Sybil) De Mortimer (born de Braose) in 1310, at age 31.
Sibyl was born in 1275, in Stinton Hall, Norfolk, England.
They had 4 children: Joan De Weyland (born De Mortimer) , Robert de Mortimer , Constantine De Mortimer Knight and William de Mortimer .
His occupation was a knight.
Constantine passed away on August 9 1359, at age 80 in Attleborough Manor, Wymondham, Norfolkshire, England.
He was buried in Mortimers Chapel, Attleborough, Norfolk, England.

https://www.wikitree.com/wiki/Mortimer-804

Constantine de Mortimer formerly Mortimer
Born about 1270 in Norfolk, England
ANCESTORS
Son of William (Mortimer) de Mortimer and Alice (Toeni) Mortimer
[sibling%28s%29 unknown]
Husband of Sibyl (Braose) de Mortimer — married 1294 [location unknown]
DESCENDANTS
Father of Robert Mortimer
Died about 1334 at about age 64 in Norfolk, England
Profile last modified 5 May 2021
Created 31 May 2016

Biography
Blomefield wrote:

Constantine, his son and heir, then 16 years old, whom the King seized as his ward; but in 1298, John Earl Warren sued the King for his wardship, which belonged to him, in right of the manor of Atleburgh, which was held of him, and was unjustly seized by the escheator, while the Earl was in the King's service in Scotland, who as unjustly assigned to [Alice] the relict of the said William, much more than her just dower, upon which the Earl had his ward, and took from Alice those lands which she enjoyed above her dower; and the same year the said Constantine [by the Earl his guardian] sued Joan, late wife of Gilbert Peche, for committing waste in his manor of Kingstone, while she had the custody of it; in 1305, he obtained a charter for a market and fair to be kept at Kingston; in 1307, he was one of the great men in the retinue of John de Warren Earl of Surrey, who was then with the King in France, at his interview and marriage with Isabel, daughter of Philip King of France; in 1309, he held his manors and lands in Atleburgh, Elingham, and Bernham-Parva, of the Earl Warren, at one fee; and in 1310, had a charter for a yearly fair at his manor of Atleburgh, and was in the Scotch expedition; and again in 1313 and 1314, in which years he had license to found a chantry at his manor of Kingston, and to make a castle of his house at Scoulton in Norfolk; in 1315, he settled Atleburgh on himself and Sibil his wife, for life, Henry de Spectishall, parson of Kingston, and John de Bernham, parson of Bykereston being trustees; in 1329, upon the death of Thomas de Cailly, the custody of Bukenham castle was committed to him; he had two wives, Katherine and Sibil, who died the 9th of Sept. and he the 12th of Nov. following, in the year 1334, and were buried in Mortimer's chapel, leaving
Sir Constantine Mortimer, Knt. his son and heir, who was of full age; for the year following, viz. 1335, he was Steward of the Household to Elianor Countess of Gueldres, [the King's sister,] and had au allowance of 22l. for the charges of his men and horses in that service;
Sources
Francis Blomefield, 'Hundred of Shropham: Atleburgh', in An Essay Towards A Topographical History of the County of Norfolk: Volume 1 (London, 1805), pp. 501-541. British History Online http://www.british-history.ac.uk/topographical-hist-norfolk/vol1/pp... [accessed 20 July 2018].