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In page Pope Clement VII:

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But deeply concerned about Imperial arrogance, he was to pick up with France again when Francis I was freed after the Treaty of Madrid (1526): the Pope entered into the League of Cognac together with France, Venice, and Francesco II Sforza of Milan. Clement VII issued an invective against Charles V, who in reply defined him a "wolf" instead of a "shepherd", menacing the summoning of a council about the Lutheran question.[citation needed]