De Witt's power base was the wealthy merchant class into which he was born. This class broadly coincided politically with the "States faction", stressing Protestant religious moderation and pragmatic foreign policy defending commercial interests. The "Orange faction", consisting of the middle class, preferred a strong leader from the Dutch Royal House of Orange as a counterweight against the rich upper-classes in economic and religious matters. Although leaders that did emerge from the House of Orange rarely were strict Calvinists themselves, they tended to identify with Calvinism, which was popular among the middle classes in the United Provinces during this time. William II of Orange was a prime example of this tendency among the leaders of the House of Orange to support Calvinism. William II was elected Stadholder in 1647, and continued to serve until his death in November 1650. Eight days after his death, William II's wife delivered a male heir—William III of Orange. Many citizens of the United Provinces urged the election of the infant William III as stadholder under a regency until he came of age. However, the Provinces, under the dominance of the province of Holland did not fill the office of Stadholder.