Crown Principality
Drachenwald's Crown Principality of Insulae Draconis is a grandfathered group, existing in an unusual and, this author believes, unique state at the time of this writing (September, 2006).
A Crown Principality has no formal existence according to the SCA governing documents. It is essentially a semi-formal declaration of intent to work toward Principality status by a collection of branches that wish to form a principality, but which do not meet one or more of the requirements, usually sufficient numbers. Since it is not a group designation recognized by the SCA, it has no laws, and no formal officers or ceremonial head.
As an adminstrative unit, it may be compared to a region such as those found in the East Kingdom.
However, Kingdom Law and Custom may depute certain powers of the Crown to sub-groups. Thus law and custom may dictate that a Crown Principality have a ceremonial head, such as that of Insulae Draconis, whose heads are styled as Viceroy and Vicereine. Likewise, law and custom may allow those heads to grant non-armigerous awards.