What limits on royal proclamations did Sir Edward Coke describe in 1610?

In 1610, during a celebrated opinion delivered before the royal council, Sir Edward Coke asserted that the king’s power to issue proclamations was limited by the common law. Specifically, he stated that the king does not have the authority to change any part of the common law, nor can the king create any offense by proclamation that was not already considered an offense prior to that proclamation.1