We’re a nation obsessed with genealogy. Millions of us are gripped by TV shows like 'Who Do You Think You Are', where genealogists show celebrities their famous ancestors - like Danny Dyer being descended from Edward III, the first Plantagent King! But what if Danny doesn’t get exclusive bragging rights? With the help of mathematician Hannah Fry and Habsburg Royal Historian professor Martyn Rady, population geneticist Dr Adam Rutherford sets out to prove that we're all descended from royalty, revealing along the way that family trees are not the perfect tool for tracing your heritage. But can it really be true? Can we all be descended from Henry VIII or Charlemagne!?