Answer:
Parliament declared that its sessions should be held frequently because they needed to make sure that monarchs would not prevent them from being part of the decisions related to government affairs.
Step-by-step explanation:
Parliament (meaning 'an occasion for speaking') originated from the Great Councils (nobility and senior clergy), which the monarchs summoned regularly to ask for advice on important matters. However, some monarchs, especially Henry III, were unwilling to consult these men because they wanted to concentrate all the power for themselves and by consulting Parliament, they would have to grant some of this power to them. Eventually, Parliament took over and reduced the power of the monarchy.