There is no historical record of any king marrying his brother. It is possible that some rulers may have had relationships with other men, but these relationships would not be considered marriage as it is understood today.
Marriage, historically, has been a union between a man and a woman, often for political or social reasons. While some cultures may have had different interpretations of marriage, the concept of a king marrying his brother would be highly unusual and likely not recognized as a valid marriage by most societies.
