I get messages urging me to try Artificial Intelligence -- Chat GPT. So I asked it, "Who are Rhodri Mawr's Ancestors?"
Here's the answer it gave me right away. One could do a lot worse! Rhodri Mawr, also known as Rhodri the Great, was a King of Gwynedd in Wales during the 9th century. His ancestry is traced through the royal genealogies of Wales. Rhodri Mawr's paternal ancestry connects him to the House of Cunedda, a prominent royal lineage in medieval Wales. Rhodri Mawr's father was Merfyn Frych, and his grandfather was Gwriad ap Elidyr. Gwriad ap Elidyr is often considered to be the founder of the Merfynion dynasty, to which Rhodri Mawr belonged. The genealogies trace the lineage further back, claiming descent from Cunedda Wledig, a legendary figure who played a significant role in the early history of the Kingdom of Gwynedd. It's important to note that genealogies from this period often include mythical or legendary elements, and the historical accuracy of specific details may be challenging to verify. The information about Rhodri Mawr's ancestry comes from medieval Welsh sources, such as genealogical manuscripts and chronicles.
Its sources are the same as used by Geoffrey of Monmouth: a certain very ancient book written in the British language.
People might like to look at this question about AI as well.
Same. It's been a few months since I tried, but it made up biographical details and made up sources.
Edit: Some lawyers have learned the hard way. Lawyers have real bad day in court after citing fake cases made up by ChatGPT