I've just bought and played 'Richard the Third' by Columbia Games and not only found it to be one of the best looking games that I've seen, but it also gives a great flavour of the changes of alliegences that occured during the 'Roses' period. Although a block game it is parsecs ahead of the early block games by Columbia, easily on a par with GMT. Definately worth a look. I also have 'Pax Baltica' on the Thirty Years War which has similar mechanics.