Henry Sinclair (1508–1565) was a Scottish lord-president of the court of session and bishop of Ross. Henry Sinclair was brother of Oliver Sinclair. He studied at St. Leonard's College, St. Andrews and was appointed lord of session in 1537. In 1541 he was named abbot or perpetual commendator of the abbey of Kilwinning. He was the negotiator of a peace treaty between Flanders and Scotland in 1548 and was appointed dean of Glasgow in 1550. Between 1550 and 1554 he was in France. He was a commissioner for the Treaty of Carlisle in 1556, and for that of Upsettlington in 1559. He was appointed President of the Court of Session, and Bishop of Ross. In 1561 he became a member of Queen Mary's privy council. Denounced by John Knox, he maintained a neutral religious attitude. He wrote additions to Boece's History of Scotland. Sinclair died at Paris in January 1565. Life Henry Sinclair was the second son of Sir Oliver Sinclair of Roslin brother of John Sinclair (died 1566), bishop of Brechin, and uncle of Oliver Sinclair, general at Solway Moss. It seems probable that he was born well before 1508 (as given in some sources). Henry's parents were married after 1485 (when his mother was only about 15) and probably closer to 1490 (first note of his eldest brother George is in 1491). He studied at the University of St. Andrews, being incorporated in St. Leonard's College in 1521. Having gained the special favour of James V, he was admitted on 13 November 1537 an ordinary lord of session. On 16 December of the same year he obtained the rectory of Glasgow from Archbishop Dunbar; in 1541 he was named abbot or perpetual commendator of the abbey of Kilwinning; and in 1550 he exchanged this office with Gavin Hamilton for the deanery of Glasgow. While he was dean he bought and sold some land from Melrose Abbey making a good profit. In 1548 he was sent into Flanders to treat for a peace between Flanders and Scotland. On 11 August 1550, he obtained a safe-conduct to go into France, and apparently did not return to Scotland until 1554. Immediately on his return he persuaded Robert Reid, the bishop of Orkney, then Lord President of the Court of Session, to make certain statutes for the abbreviation of the processes and the reform of other abuses. He was a commissioner for