John William Friso is the most recent common ancestor of what
John William Friso, Prince of Orange John William Friso, Prince of Orange-Nassau (Dutch: "Johan Willem Friso van Oranje-Nassau" ; 14 August 1687 – 14 July 1711) became the titular Prince of Orange in 1702. He was stadtholder of Friesland until his death by drowning in the Hollands Diep in 1711. Friso and his wife, Marie Louise, are ancestors of all European monarchs occupying the throne today.
Bile (Irish legend) Bilé is a character in the "Lebor Gabála Érenn", a medieval Christian history of Ireland and the Irish (or Gaels), and in the genealogies of John O'Hart based on this tradition. He is described as a king of Galicia, an ancestor of the Gaels, the son of Breogan, and the father of Milesius. The "Lebor Gabála" purports to be an account of the Gaels' descent from Adam through the sons of Noah and how they came to Ireland. The tale relates that the Gaels spent 440 years wandering the Earth and underwent a series of tribulations, loosely based on the tale of the Israelites in the Old Testament. Eventually, the Gaels sailed to Iberia and conquered it. There, one of their leaders, Breogán, founded a city called Brigantia and built a great tower. From the top of the tower, his son Íth glimpses Ireland. The Gaels—including some of Breogán's sons—sailed to Ireland from Brigantia and took it from the Tuatha Dé Danann, the Irish pagan gods. Brigantia likely refers to A Coruña in Galicia (which was then known as Brigantium) and Breogán's tower is likely based on the Tower of Hercules (which was built at A Coruña by the Romans) or the Tower of Babel. The idea that the Irish Gaels came from Iberia may be based on the similarity of the names "Iberia" and "Hibernia" and the names "Galicia" and "Gael". Bilé is listed as the father of Fuat, a son who traveled to Inis Magdana, Moagdéda, or Mor-Oc Diada ("Great Young Divine"), an island where no man could tell a lie; Fuat brought a piece of sod from Inis Mor-Oc Diada back to Ireland, which he placed under his seat of judgement, and which turned upside down whenever he spoke a lie.