The vast powers that belong to the Crown are collectively known as the Royal Prerogative, which includes many powers such as the ability to make treaties or send ambassadors, as well as certain duties such as to defend the realm and to maintain the Queen's peace. Parliamentary approval is not required for the exercise of the Royal Prerogative; moreover, the Consent of the Crown must be obtained before either House may even debate a bill affecting the Sovereign's prerogatives or interests. It is important to note that the Royal Prerogative belongs to the Crown, and not to any of the ministers, though it may sometimes appear that way. Although the Royal Prerogative is extensive, it is not unlimited. For example, the Monarch does not have the prerogative to impose and collect new taxes; such an action requires the authorisation of an Act of Parliament.