Sir John Byron

✓ Sir John Byron of Clayton, Lancs., and South Stoke, Lincs. (c.1386-1450), MP Lancashire 1421, 1429, Lincolnshire 1447, Sheriff of Lancashire 1439-d.; son and heir of Sir Richard Byron and Joan Colwick; m. Margery, da. of John Booth I; at least 5s., 5da. Father of Helena, 1st wife of Walter Blount, Lord Mountjoy (CP 'Mountjoy'). Source: History of Parliament 1386-1421, 'BYRON, Sir John (1386-1450), of Clayton' and 'BOOTH, John I (d.1422)'. [DIRECT ANCESTOR OF THE COMPILER: flag added 22 Oct 2026 by walking the tree from Aynsley, so that this marker is reliable and can be searched.]