Why was it important to for a medieval leader to have the pope's blessing to rule?
a) it prevented invasion from enemies.
b) it provided legitimacy to the person's rule.
c) it meant the leader could possibly become pope.
d) it meant the church would send troops in times of war.

It was oftentimes very important for a medieval leader to have the Pope's blessing to rule because "B) It provided legitimacy to the person's rule," since the Pope and the Church held a great deal of power in medieval society. 

How  did spanish  power increaseunder charles  v and philip ii? in 1519,charles  v inherited a huge empire. he became king of  spain  and was also the heir to the hapsburg empire. during his 42-year reign, philip worked to expand  spanish  influence, strengthen the catholic church, and make his own power absolute. hope this !