Is your last name Somerset, Neville, Plantagenet, Ibsen, Constable, Babthorpe,Cholmley, Slingsby, Bellasis, Talbot, Yelverton, Calthorpe, Gough, Spooner, Neale, Frere, Stokes or even Brown?
Then Pop-up Globe wants to hear from you because you could be distantly related to one of the most infamous monarchs in English history.
The theatre company, now staging Shakespeare's Richard III, is searching for living relatives of the king who died at the Battle of Bosworth Field in 1485 after just two years on the English throne.
Artistic director Dr Miles Gregory says those who can produce proof of bona fide genealogical research, such as a family tree, might be in line for complimentary tickets, a backstage tour and meeting the cast and company.
But Pop-up Globe could be in for more than it bargained for - Richard is thought to have as many as 17 million living relatives in the UK alone. They include actor Benedict Cumberbatch, who is Richard III's second cousin 16 times removed.