If you know the White family in Booterstown, Dublin, you had better watch your Ps and Qs because they have connections to the British royal family.

Genealogists have discovered a distant “rags-to-riches” Irish cousin of Britain’s Prince William on a 19th century document dedicated to an English lord.

A mammoth research project is seeking to trace descendants of 250,000 signatories to a pre-famine petition showing their appreciation for an English lord.