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Charles Howard McIlwain commented that the claim made by the Commons for jurisdiction under parliamentary privilege was "the most extensive and the least justifiable, perhaps, in all parliamentary history; and the far-fetched arguments brought forward in debates in support of the claim are of great interest", citing the record in Thomas Barrington's diary of the parliament.
Barrington was the eldest son of Sir Thomas Barrington of Barrington Hall, Hatfield Broadoak, Essex (died 1586) and as her second husband Winifred Pole (b. aft. 1521 or in 1525), youngest daughter of the 1st Baron Montagu.
Winifred Pole (b. aft. 1521 or in 1525), married firstly Sir Thomas Hastings (1515–1558, buried Stoke Poges, Buckinghamshire, the brother of her sister Catherine's husband), son of George Hastings, 1st Earl of Huntingdon, without issue, and secondly, Sir Thomas Barrington of Barrington Hall, Hatfield Broadoak, Essex (died 1586).
He was the second son of Thomas Barrington, in turn first son of Sir John Barrington, 3rd Baronet, and his wife Lady Anne Rich, daughter of Robert Rich, 3rd Earl of Warwick.