[Harmless Teddy Bear]

If someone made a movie and in it a widowed princess was appointed as ambassador to a court so she could stick around and wed her dead husband's 11 year old brother it would be laughed out of the theater.

But that is what happened.

[ArtDodger]

Things were different, back then. Arranged marriages of children were done, knowing there would be no consummation (sex) until the proper age. Also, regents were appointed to make sure things went as planned.
Also, Catherine of Aragon thought God wanted her to stay in England and marry Lil’ ‘Enry.