Former athlete and Strictly Come Dancing competitor Iwan Thomas makes an emotional journey in search of his Welsh ancestry, where he learns of an ancestor's life on a grand country estate, and of his great-great-grandfather's spectacular rags-to-riches story and the fortunes he made and lost in his lifetime.

Jeremy Bowen - the veteran BBC Middle East editor - makes an emotional journey in search of his Welsh ancestry, where he learns of his great-great grandfather's early life as a child labourer and follows in the footsteps of his father, who reported on one of Wales's worst peacetime disasters.

Comedian and actor Ben Miller makes a long-cherished personal journey in search of his Welsh ancestors, discovering a tale of heroism in WWI and a surprising family link to the White House.

Legendary stage and film actress Siân Phillips makes an emotional journey in search of her early Welsh ancestors and relives a moving performance from her childhood.