What is associated with: 1455 1485 between 2 different british royal houses?

What is referred to by '14'? Based on the clue '140 is scary high on the stanford binet version of...', what is the answer? What is associated with: 1415 the battle of agincourt? What is associated with: 1453 mehmed ii begins his siege of this city it would fall 8 weeks later? What is associated with: 1461 towton yorkshire? Based on the clue '147 pounds is the maximum in this class of profess...', what is the answer? Based on the clue '148 bonnie meadow road new rochelle ny', what is the answer? What is associated with: 1485 florence was shocked by this artists large nude painting of the birth of a goddess?