The Plantagenet Succession
Threadmarks: The Power of the Plantagenets - by Alison Weir.
An excerpt from The Power of the Plantagenets - Published June 6, 1999, by Alison Weir.
To keep one of the two last Lancastrians in line, King Edward married his cousin, Margaret of Clarence, to Charles Somerset, illegitimate son of Henry Beaufort, 3rd Duke of Somerset, and his mistress, Joan...