The Descendants of the Illegitimate Sons and Daughters of the Kings of Britain—or Royal Bastards—is a group with higher standards than its name would suggest.
Membership in the society is open to anyone who can prove descent from an English, Scots, Welsh or British king through an illegitimate child, grandchild or great-grandchild of a monarch.
The very first person to be admitted was Queen Elizabeth II, who descends from King Henry I through his bastard daughter Constance. In the 27-generation pedigree are two additional illegitimacies.
The Royal Bastards' remedy for the sad state of genealogical research is to emphasize the highest standards of genealogical proofs for admission and to lead by example the rest of the hereditary societies. Obtaining membership in the organization is a mark of genealogical achievement. [Link]