A country or region with a Prince as Head of State.
A principality is a region or sovereign nation headed by a prince or a princess, or the state of being ruled by such a leader.
I'm looking for the main library in this principality.
Principality of Andorra
Principality of Regensburg was created in 1803.
Principality of Orange was created in 1163.
Principality of Orange ended in 1713.
Principality of Guria ended in 1829.
Principality of Göttingen was created in 1279.
Principality of Serbia was created in 1817.
Principality of Serbia ended in 1882.
Principality of Trubetsk ended in 1566.
Principality of Beloozero was created in 1238.
Principality of Halberstadt was created in 1648.