Saier de Quincy was created Earl of Winchester by King John about the year 1210. This nobleman was one of the lords present at Lincoln when William, King of Scotland, did homage to the English monarch, and he subsequently obtained large grants and immunities from King John; when, however, the baronial war broke out, his lordship's pennant waved on the side of freedom and he became so eminent amongst those sturdy chiefs that he was chosen one of the celebrated twenty-five barons appointed to enforce the observance of Magna Carta. Adhering to the same party after the accession of Henry III, the Earl of Winchester had a principal command at the battle of Lincoln and, there being defeated, was taken prisoner by the royalists. But submitting in the following October, he had restitution of all his lands and proceeded soon after, in company with the Earls of Chester and Arundel and others of the nobility, to the Holy Land where he assisted at the siege of Damietta, anno 1219, and d. the same year in his progress towards Jerusalem. His lordship m. Margaret, younger sister and co-heir of Robert Fitz-Parnell, Earl of Leicester, by which alliance he acquired a very considerable inheritance, and had issue, Robert, Roger, and Robert. At the decease of the earl, his 2nd son, Roger de Quincy, had livery of his father's estates.
[Sir Bernard Burke, Dormant, Abeyant, Forfeited and Extinct Peerages, Burke's Peerage, Ltd., London, England, 1883, p. 447, Quincy, Earls of Winchester]