As early as 1643, Oliver St John had urged fellow Protestants in the Netherlands to sign the Solemn League and Covenant that the Scots had already signed, but had been rebuffed. After the execution of Charles I in 1649, parliament sent an envoy to the Hague to discuss an alliance with the United Provinces, but he was murdered shortly after his arrival in reprisal for the king's death, after which the proposal was left in abeyance until more favourable times. The sudden death on 6 November 1650 of William II, the Stadholder of the United Provinces, whose popularity had declined since his election in 1647 in the face of growing discontent from the States Party in the United Provinces, changed matters. The States party was the political faction identified most closely with the idea of rule solely by the States General, and was especially powerful in the large commercially oriented province of Holland. To obtain support against William II, it had sought the assistance of Oliver Cromwell. After William II's death, the States Party was in a much stronger position politically, and no longer valued or needed Cromwell's support against the stadholderate.