Sir John Wynn, 5th Baronet

Sir John Wynn, 5th Baronet (1628 – 11 January 1719) was a Welsh landowner and Tory politician who sat in the English and British House of Commons between 1679 and 1713.

He retired at the 1713 British general election[5] Wynn lived into his nineties, mainly residing in London, but died without issue in 1719.

On his death the Wynn baronetcy became extinct and the ancient House of Aberffraw (which claimed direct descent from Rhodri Mawr ap Merfyn in the late 9th century and through him to the legendary line of Brutus) was left without known male issue.

Had Thomas Jones (Twm Siôn Cati) really been the illegitimate son of John "Wynn" ap Maredudd (as claimed by Sir John Wynn, 1st Baronet in his family history), his children would have been next in line, illegitimate sons having the same rights of inheritance as legitimate ones under ancient Welsh law.

There are also several claims that "lost" relatives such as a supposed Colonel Hugh Wynn who is alleged to have moved to Virginia and raised a family.