If they are the same, as many insist, then the question arises of how Shealtiel, like Joseph, could have two fathers. Yet another complex levirate marriage has often been invoked. Richard Bauckham, however, argues for the authenticity of Luke alone. In this view, the genealogy in "Chronicles" is a late addition grafting Zerubbabel onto the lineage of his predecessors, and Matthew has simply followed the royal succession. In fact, Bauckham says, Zerubbabel's legitimacy hinged on descending from David through Nathan rather than through the prophetically cursed ruling line.