Final answer:
The statement linking 'Prince of the Air' to Satan does not pertain to the historical fact about William of Orange being married to James II's daughter Mary and being in line for the English throne, which is true.
Step-by-step explanation:
The statement 'Prince of the Air is a common epithet for Satan' is not related to the historical information provided about William of Orange and his marriage to Mary, daughter of James II. Instead, the question asked seems to be two-fold: one part addresses a religious or literary epithet, while the other is a historical fact about succession to the English throne.
Addressing the historical aspect, the statement that William of Orange was married to James II's daughter Mary and was also in line for the throne of England is true. This was a significant factor in the events leading up to the 'Glorious Revolution' of 1688, when William and Mary were invited to take the throne, leading to James II's ousting. It is through this marriage and the complex succession situation that William had a claim to the English throne.