This situation culminated in a revolution by the nobility and high "bourgeoisie" on December 1, 1640, 60 years after the crowning of Philip I. The plot was planned by Antão Vaz de Almada, Miguel de Almeida and João Pinto Ribeiro. They, together with several associates, killed Secretary of State Miguel de Vasconcelos and imprisoned the king's cousin, the Duchess of Mantua, who had governed Portugal in his name. The moment was well chosen, as Philip's troops were at the time fighting the Thirty Years' War and also facing a revolution in Catalonia.