of ethics professor Hendrik Bornius (though never officially enrolling as a student). While residing in the Prinsenhof at Delft, William had a small personal retinue including Hans Willem Bentinck, and a new governor, Frederick Nassau de Zuylenstein, who (as an illegitimate son of stadtholder Frederick Henry of Orange) was his paternal uncle. Grand Pensionary Johan de Witt and his uncle Cornelis de Graeff pushed the States of Holland to take charge of William's education and ensure that he would acquire the skills to serve in a future—though undetermined—state function; the States acted on 25 September 1660. This first involvement of the authorities did not last long. On 23 December 1660, when William was ten years old, his mother died of smallpox at Whitehall Palace, London, while visiting her brother, the recently restored King Charles II. In her will, Mary requested that Charles look after William's interests, and Charles now demanded that the States of Holland end their interference. To appease Charles, they complied on 30 September 1661. That year, Zuylenstein began to work for Charles and induced William to write letters to his uncle asking him to help William become stadtholder someday. After his mother's death, William's education and guardianship became a point of contention between his dynasty's supporters and the advocates of a more republican Netherlands. The Dutch authorities did their best at first to ignore these intrigues, but in the Second Anglo-Dutch War one of Charles's peace conditions was the improvement of the position of his nephew. As a countermeasure in 1666, when William was sixteen, the States officially made him a ward of the government, or a "Child of State". All pro-English courtiers, including Zuylenstein, were removed from William's company. William begged De Witt to allow Zuylenstein to stay, but he refused. De Witt, the leading politician of the Republic, took William's education into his own hands, instructing him weekly in state matters and joining him for regular games of real tennis. Early offices Exclusion from stadtholdership After the death of William's father, most provinces had left the office of stadtholder vacant. At the demand of Oliver Cromwell, the Treaty of Westminster, which ended the First Anglo-Dutch War, had a secret annexe that required the Act of Seclusion, which forbade the province of Holland from appointing a member of the House of Orange as stadtholder. After the English Restoration, the Act of Seclusion, which had not remained