John Hay, 1st Lord Hay of Yester (c. 1450 – after October 1508) is the ancestor of theMarquesses of Tweeddale. He was created aLord of Parliament on 29 January 1488 byJames III of Scotland.

He was born inPeebleshire, the son of Sir David Hay of Locherworth, Peebleshire, and later Yester inEast Lothian (d. c. 1478) by his wife Elizabeth (b. c. 1400), daughter ofGeorge Douglas, 1st Earl of Angus (1370–1402) by Princess Mary (d. before 1458), daughter ofRobert III, King of Scots.

John Hay married (1) Mary (d. c. 1467), daughter ofJohn Lindsay, 1st Lord Lindsay of the Byres, and (2) by contract before 17 December 1468, Elizabeth (d. 1529), daughter of George Cunningham of Belton. There were children by both marriages:

• (1) Sir Thomas Hay, Master of Yester (d. 1491), who married Elizabeth (c. 1477–1544), daughter ofAlexander Home, 2nd Lord Home, who later marriedJames Hamilton, 1st Earl of Arran^[1]
• (1) Isabel, who married SirWalter Ker of Cessford, & Caverton (d. c. 1601)
• (2) SirJohn Hay, 2nd Lord Hay of Yester (killed at theBattle of Flodden)
• (2) George Hay ofMenzion
• (2) Isabella, who married SirRobert Lauder of The Bass, Knt
• (2) Margaret (d. c. 1525), married in 1491 toWilliam Borthwick, 3rd Lord Borthwick (1460s – c. 1507)

• The Scots Peerage, by SirJames Balfour Paul, Edinburgh, 1905, under 'Tweeddale'.
• The New Extinct Peerage, 1884-1971, by L.G. Pine, London, 1972, p. 33.
• Burke's Peerage, Baronetage and Knightage, edited by Peter Townend, 105th edition, London, 1970, p. 2697.
• The Magna Charta Sureties 1215, by Frederick Lewis Weis, et al., 5th edition, Baltimore, 2002, p. 51.

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