Princess of Thrace

From Equestripedia, the Archives of Equestria!

Princesses of Thrace refers to the female kin of the King of Thrace. There were at least four known princesses, and they all seemed to live in the Castle of Thrace, with the eldest known princess, Terri Belle, appearing to be a high ranking individual in her own right.

The powers and duties of these individuals were unclear.