Actor Michael Sheen kicks off the new series of the BBC Cymru Wales family history programme Coming Home tomorrow evening.
The 41-year-old actor is well-known for his Welsh roots. Born in Newport, Sheen was brought up in Baglan, Port Talbot. He frequently returns to Wales to visit his mum Irene and dad Meyrick, who still live in the house he grew up in.
As part of Sheen's quest to find out more about his father's side of the family he visits Cardiff's Catholic cathedral where he uncovers an entry for his great-great grandfather Thomas Sheehan in the baptismal register.
Thomas Sheehan was one of 14 children, eight of whom passed away, seven in infancy - a fact that moves Sheen as he inspects the death certificates.
"There's something rather bizarre about seeing the death certificate of someone with the same name as you," he says.
Find out more about Michael Sheen on the BBC Wales Arts website.
If Coming Home inspires you to trace your family history, then take a look at the hints and tips in our family history section on the Wales History site.
Coming Home, Wednesday 24 November, 7.30pm BBC One Wales