What did the king of England need that the great councils approval for?

The king of England needed the Great Council's approval primarily for matters related to taxation and significant changes in governance or law. The Great Council, which included nobles and clergy, acted as an advisory body that represented the interests of the realm's powerful families. This requirement helped ensure that the king maintained support from influential subjects and prevented unilateral decisions that could lead to unrest. Over time, this practice evolved into the parliamentary system we recognize today.