I am part way through the book "William's Mary", and I was just amazed at the devotion those two had for one another, especially after Mary's initial reluctance to marry him.  Reading exerpts from her letters, they were so touching, and how William would read them while sitting atop bags of army supplies, he must have looked forward to recieving them. His reaction to her death and illness.... it almost reads like a love story.  I haven't read much about other monarchs who felt so strongly about one another.

 

Do you think perhaps, since they did not have children, it enabled them to devote themselves to eachother more?  Their relationship seems more like a partnership, based on mutual respect, and the love came from that.