The Duchy
 What is a Duchy?
The exact size required to become a Duchy varies a bit from kingdom to kingdom. The most common requirement is "40 unique sign-ins per month", though at least one kingdom requires 30 sign-ins per week.
The minimum required to keep this status likewise varies.
 What can a Duchy do?
A Duchy is allowed to give ladder awards up to the 6-8th level depending on their kingdom's corpora. The ability to grant noble titles and class masteries varies wildly from one corpora to the next. The author is unaware of any kingdoms that permit duchies to give out order masteries (rose, garber, warlord, etc).
The elected leader of a Duchy is a Duke or Duchess. Other offices that may or may not be filled due to the needs of the park are Regent, Prime Minister or Chancellor and Champion. Most of these offices are exclusively voted on, though many corporas require that a champion be chosen by Right of Arms.