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'John Hay, 2nd Marquess of Tweeddale' (1645 - 20 April 1713) was a Scottish nobleman.
Hay was the eldest son of John Hay, 1st Marquess of Tweeddale.
In 1666, at Highgate in London, he married Lady Mary Maitland, daughter of John Maitland, 1st Duke of Lauderdale (1616-82). However, Lauderdale set himself against Hay, who was forced to leave for the continent and did not regain his position until Lauderdale's death in 1682.
He was created a privy councillor in 1689 and became Lord Treasurer in 1695. He succeeded his father to the Marquessate in 1697.
He was appointed Lord High Commissioner to the Scots Parliament in 1704, and was Lord Chancellor of Scotland from 1704-5. He led the Squadrone Volante, but ultimately supported the Union. He was appointed a Scottish representative peer in 1707.
His eldest son, Charles (c. 1670-1715), became 3rd marquess. A younger son, Lord John Hay (d. 1706), commanded the famous regiment of dragoons, afterwards called the Scots Greys, at the battle of Ramillies and elsewhere.