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.
Brevirostres Brevirostres is a clade of crocodylians that includes alligatoroids and crocodyloids. Brevirostres are crocodylians with short snouts, and are distinguished from the long, slender-snouted gharials. It is defined phylogenetically as the last common ancestor of "Alligator mississippiensis" (the American alligator) and "Crocodylus niloticus" (the Nile crocodile) and all of its descendants. Below is a cladogram showing the phylogenetic relations of Brevirostres from Brochu (1997):