I'm not sure exactly. Probably I'd go with Reenk Roink - Absolute (Enlightened).

In theory it's the best, right up until a complete prat is on the throne (look at the Ottoman Empire for example).

In the UK, MPs and Civil Servants effectively supervise themselves and this shows with their toothless regulators, massive pensions and holidays (and they can still whinge!). If oversight was in the hands of a "good" Monarch this could be kept in line. Our current incumbent would be up to it, but it does create massive problems if the position of power is abused.