Is a monarchy ruled by just a king or queen?

generally a king will rule in his own right.he may have as his wife a queen but she has no constitutional powers. a queen who rules alone such as elizabeth 2 of the United Kingdom is married to philip duke of edinburgh he is lower in the pecking order occasionally joint monarchs rule as in William and Mary of England 1688 both having equal claim to the throne .most modern monarchs are constitutional having no real powers