Sir Thomas was the eldest of the seven sons of William Robinson, of Rokeby, Yorkshire, by his wife, _née_ Anne Walters. He was born and baptized at Rokeby in 1700. After his school-days he made the grand tour, as was the fashion of the day, and then entered the Army. At the death of his father in 1719, he succeeded to the family estates in Yorkshire. At the General Election of 1727 he became M.P. for Morpeth. On October 25, 1728, he was married at Belfreys, in Yorkshire, to Elizabeth, widow of Nicholas, Lord Lechmere, and daughter of Charles Howard, 3rd Earl of Carlisle. Between the years 1725 and 1730 he rebuilt the house at Rokeby, removed the church which stood behind the house and rebuilt it in another spot, he added a stone wall all round the park, made a bridge over the Greta river, and erected an obelisk to his mother’s memory in 1730. All these acts were recorded on two stone piers at the Greta entrance of the park. He planted many trees at Rokeby. He designed the west wing of Castle Howard for his brother-in-law, Lord Carlisle. In 1731 he was made a Baronet of England, with remainder to his brothers. His nickname of “Long” Sir Thomas Robinson was given to him from his great height, and to distinguish him from another Sir Thomas Robinson, a diplomat of note, afterwards created Lord Grantham. These two men were the reverse of each other in appearance, “Long” Sir Thomas being exceptionally tall, and the other very short and fat. One of Lady Townshend’s _bon mots_ about the two was, “Why one should be preferred to the other I can’t imagine, there is but little difference, the one is as broad as the other is long;” and Lord Chesterfield, on being told “Long” Sir Thomas was reported to be “dying by inches,” said, then it would be some time before he was dead. On April 10, 1739, his wife, to whom he was tenderly attached, died at Bath, and was taken to Rokeby and buried under the new church he had erected. A monument was erected to her there. In accordance with Sir Thomas’s will, though he himself was buried at Merton Abbey, Surrey, a cenotaph was placed in Poets’ Corner, Westminster Abbey, to his and his wife’s memory, with medallion portraits of her and himself, and bearing the following inscription:--“To perpetuate his grateful sense of the pleasure he had in the conversation of an accomplished woman, a sincere friend, and an agreeable companion.” They had no children, so the English baronetcy went to his next brother, William.