Here's what the Metropolitan Museum of Art has to say about The Compendium of History through the Genealogy of Christ by Peter of Poitiers.
Admirable for its concision and graphic boldness, this imposing scroll presents a history of the known world from the creation of Adam until the birth of Jesus. It is a teaching tool—a graphic summary of a classroom text. The ancestry of Jesus, traced back to the first man, is shown through a stemma (a system of lines and framed circles that runs down the center of the scroll’s length). Noteworthy ancestors, including King David with his harp, are pictured at regular intervals along the stemma. Successions of biblical rulers, as well as the lineage of ancient rulers of the Near East, Greece, and Rome appear on less elaborate stemmata that diverge from, converge with, and run parallel to that central history.Sounds authentic to me. I wonder who is listed as the father of Jesus and if the genealogy covers the ancestors of Mary all the way back to Eve?
Peter of Poiters lived in England and the scroll was created in the 1200s. I bet he had lots of fun searching ancestry.com and all the census records from Ur and Egypt.
Here's photo that I took at The Cloisters.
1. It was in a dark corner and my Latin is a bit rusty.