How did Parliament restrain royal power when it met in1640?

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The decision to meet every three years without the king's call was a restriction on royal power because, prior to this, the king had the power to dissolve Parliament and call for new elections at his whim. This limitation on the king's power was an important step towards limiting absolute monarchy. While Parliament did gain some lawmaking power and jurisdiction over some courts, these changes were not as significant as the restriction placed on the king's power to dissolve Parliament. Parliament did not become the body that elects monarchs; although, it did have some say in the process following the Glorious Revolution of 1688.

How Did Parliament Restrain Royal Power When It Met In1640