Thomas de Chauncy, son and heir of William de Chauncy, gained his baronial inheritance, the fourth part of the barony of Skirpenbeck, and Bugthorpe and Thoralby, in 1344, which was the 17th year of the reign of King Edward III.
Given that the year of birth of his heir and son William de Chauncy is estimated to be about 1345, and that his father William de Chauncy was age 20 in 1309, the 2nd year of King Edward II, and so born about 1289, the estimated year of birth of Thomas is likely in the range 1310-1320; average 1315.
In 1358, in the 31st year of the reign of King Edward III and just 14 years after he had gained his own inheritance, Thomas de Chauncy enfeoffed to his first-born son William and Joan, daughter of Roger Bigod, "rectine, lands and tenements" in Thoralby and Skirpenbeck. (Rotulorum Originalium Abbreviatio, volume II, p. 246, foot of first column).
Thomas de Chauncy died in 1376 in the 49th year of the reign of King Edward III, and though no marker survives it is likely is buried in the churchyard of St. Mary in Skirpenbeck.
(Memorials of the Chaunceys, Including President Chauncy, His Ancestors and Descendants, by William Chauncey Fowler, Dutton and Son: Boston, 1858, pages 39-41).