What were the developments that led to increases in monarchical power at the end of the middle ages?

During the end of the middle ages, monarchical power was more distributed among more individuals but became more centralized, which gave the monarchs more control over the people. These developments are:

The common law or the Single Law Code which based trials on the decision of the Jury, the Nobility having the right to form a Parliamentary government, the power extending from only England to Wales, Scotland, and Ireland during the 1300's, Capetian Kings gaining more power and influence, and monarchial countries controlling certain lands such as England controlling Brittany or Aquitaine. 

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