@talk72000,
One of the really dumb things that people did in Medieval times . . . and, as I may have written, many consider Henry VIII the last Medieval king of England . . . was to marry women who had proven fertility. Divorce was common during the Middle Ages and partners were frequently traded among the nobility. Henry did not initiate the practice of divorce.
But, back to those ladies chosen for their ability to give birth to healthy infants: they were often too old to bear children by their third or fourth marriage.
Catherine was the daughter of Isabella, one of the most powerful women ever to walk the face of the earth.
Most of those princesses did not turn Henry down because he was no longer attractive. They knew what had happened to Anne and Henry was widely regarded as poor husband material. Many Americans consider Anne something of a whore but Jane Seymour possessed a considerably more flexible moral compass than Anne did.
Catherine Parr was twice a widow.
There is a little rhyme to help remember henry's wives: divorced, beheaded, died, divorced, beheaded. survived.