Fürst

Brechtür » Title » Fürst
Fürst (feminine: Fürstin) is an unusual title among the Brecht for the regent of a realm. The word is simply an application of the word "first", indicating a ruler who is first in his realm. This title is possibly a native variant of the Anuirean title, Prince. It also indicates someone who is first, or principle, in their realm.
The adjectival prefix "Fürstliche" means "pertaining to a Fürst" and is typically attached to the word in question. Such as, "Fürstlicheburg" for the castle of the Fürst.
A Fürst's realm is generally referred to as a Fürstentum.