Originally Posted by CyrilVladisla
Princess Maud became the wife of King Haakon VII.
She was Anglican.
Did she have to change her religion when she married her cousin Prince Carl of Denmark?
I'm not sure of the proper answer for this.
However, Wikipedia lists her religion as Anglican, so I'm inclined to believe she didn't convert.
It's my understanding that most Protestant/Anglican monarchies don't require spouses to convert to Anglicanism unless they come from a non-Protestant/Anglican religion, provided that they consent to raise their children in the religion of the realm. Even with other religions, it's not necessarily a requirement that they convert provided there are no laws saying otherwise and the children are raised in the "right" religion.
If Maud had been marrying a Catholic or Orthodox monarch she would have probably had to convert, or if she herself had been Catholic or Orthodox, she would probably have had to convert to marry Haakon/Carl.