Buckingham uprising, fled to Brittany, where Henry Tudor was hiding, and later won the throne with his help. Thanks to his service and family connections, John found himself in favour with Henry VII, who, immediately after his accession to the throne, appointed his uncle constable of two important castles, gave him several estates, and later returned John's father's possessions to John; in addition, John was not only restored to his father's baronial title, but also granted a new one –Viscount Wells. There is no record of the time and circumstances of the marriage of Cecily and John Welles, who was older than the princess by about 20 years, but it happened before December 1487 or on New Year's Day 1488. Alison Weir writes that the marriage took place between 25 November and 31 December 1487; at the same time, she notes that the royal couple was present at the wedding. According to Mary Ann Everett Green, in December 1487 Cecily joined the Christmas celebrations at Palace of Placentia with her husband. On New Year's Eve, the Welles were present, among other representatives of the nobility and close associates of the king, at a dinner; Viscount Welles presented the king, as a gift from himself and his wife, with twenty shillings. At the banquet, the couple were separated: John was sitting at the table on the right side of the hall, and Cecily was at the head of the table on the left. It is not known for certain who was instrumental in the union of Cecily and John. Some historians believe that it was Henry VII who arranged the marriage of his wife's sister to his uncle in order to avoid Cecily's marriage to a more prominent representative of the nobility, since the princess became the legitimate heir to the throne in the event of the death of her sister Elizabeth and her children. On the other hand, Thomas Fuller wrote that Henry VII did not intend to marry Cecily at all, but she took matters into her own hands and chose the king's uncle as her husband, who after the conclusion of the marriage did not receive any more titles. In addition, Cecily was close to the king's mother, Lady Margaret Beaufort, who, in turn, was close to the Welles and could arrange this marriage. Regardless of who initiated the marriage, it was beneficial for both parties, as it