Joan Tudor was born circa 1453 in Snowdon, Carnarvonshire, Wales, United Kingdom and died 1495 Llanishen, Glamorganshire, Wales, United Kingdom of unspecified causes. She married William Ap Yeuan Williams (c1443-) 1465 JL .
Note that the learned genealogists at https://groups.google.com/forum/?hl=en#!topic/soc.genealogy.medieval/Itpc3_i-_7Y consider that the marriage of William Williams to a Joan Tudor was a fiction, probably created to boost the later Cromwells. He presumably had a wife, and she may have been Joan, but we have deleted the Tudor and Woodville parentage from this page.
Siblings
Children
| Name | Birth | Death | Joined with |
| Morgan ap Williams (c1465-) | 1479 Llanishen, Glamorganshire, Wales, Llanishen, Glamorganshire, Wales | Katherine Cromwell (c1468-) | |
| John ap Williams (c1485-) | |||