Because he is married to the QUEEN, not the other way around.
A KING is the superior to the queen. Elizabeth was the MONARCH, She is a Queen Regnant, and her husband can NOT have a title superior to hers.
Why didn't you check the other 500 times this question has been asked before posting it?
He didn't "jointly rule", so...I.
He ruled Spain, she ruled England.
Actually, Ali, very funny, except Prince Charles could choose to reign under the name of Philip...so, he would be Philip I should he choose that name.
Nobility runs from father to son.
If your mother was from Denmark, and she is from a noble family, YOU aren't nobility.
Someone in your background probably was. Search the name and see what you can find out.
Who is " Queen Isabella"?
What country?
Cause, it would seem you are referring to the Queen of Castilla, except that her name was ISABEL.
Isabella is Italian. She was Spanish.