Diana, Princess of Wales (Diana Frances Spencer; 1 July 1961 – 31 August 1997) was the first wife of Charles, Prince of Wales, heir to the British Crown. They were married in 1981 and divorced in 1996.
Later in the investigation, Colonel Bushell had a conversation with Major Shikalimo on the Iroquois' family structure and how the Major found them somewhat oppressive after he lived the English style in university. He commented that this, along with him being the heir of the Grand Sachem, made him feel more sympathetic to the scandalous behaviour of the princesses in the odd branches of His Majesty'sfamily tree.
While the princess is not named, at the time the novel was published, Princess Diana was common tabloid fodder with photos as described above being published. Since she was a blonde, the reference would lean towards her, rather than the red-headed Sarah Ferguson. However, due to the novel's use of fictional royals such as Edward IX and Charles III, it can be debated as to whether this princess is the actual Diana Spencer or a close analog.