Map
TLDR
The Rock of Bral is one of the asteroids making up the Tears of Selune (a cluster of asteroids), which orbits the planet Toril (the planet of The Forgotten Realms). It is the site of the city of Bral. The Rock of Bral, and Bral are often used interchangeably to describe the asteroid and the city that sits atop it.
Government
The Rock is rules by Prince Andru the grandson of a previous ruler. However, other factions have ruled at various times.