I found an article you might be interested in:
Walsall reader finds he has royal blood By Black Country Bugle | Posted: June 22, 2014 By Dan Shaw
In the 1420s a lowly Welsh nobleman, Owen Tudor (c.1400-1461), was appointed Keeper of the Queen's Wardrobe to Catherine of Valois (1401-1437), the widow of Henry V (1386-1422). Rather embarrassingly, the young widow became pregnant with Tudor's child.
They were surreptitiously married and went on to have at least six children. The eldest, Edmund Tudor (1430-1456), was the father of King Henry VII (1457-1509). Their second son, Jasper Tudor (1431-1495), became a powerful figure in the new Tudor dynasty that ruled England after 1485. He had a number of illegitimate children, among whom was a daughter named Joan (d.1479). She married William Williams (1443-1473) and it is from her that Bernard traces his descent, a direct line of succession to his mother, Elsie Arminella Jones (1892-1957). http://www.blackcountrybugle.co.uk/Reader-finds-royal-blood/story-21254287-detail/story.html