The title of Prince of the United Kingdom is granted by its sovereign—the reigning king or queen—who is the fount of all honours, and is conferred through the issuing of letters patent as an expression of the royal will. Individuals holding the title of prince will usually also be granted the style of Royal Highness. When a British prince is married, his wife, if not already a princess in her own right, gains the privilege of sharing in her husband's princely title and the dignity of being known as a British princess in his name. For example, the wife of Prince Michael of Kent is known as Princess Michael of Kent, and, Catherine, Duchess of Cambridge is entitled to refer to herself as a Princess of the United Kingdom.