In England, Wales and Ireland a county palatine or palatinate was an area ruled by a hereditary nobleman enjoying special authority and autonomy from the rest of a kingdom. The name derives from the Latin adjective palātīnus, "relating to the palace", from the noun palātium, "palace". It thus implies the exercise of a quasi-royal prerogative within a county, that is to say a jurisdiction ruled by an earl, the English equivalent of a count. A duchy palatine is similar but is ruled over by a duke, a nobleman of higher precedence than an earl or count.