Alderaan

Alderaan is a home planet in the space in Core Worlds. Within the story, it is the home of the fictional characters such as Princess Leia, Bail Organa and also, in 4000 BBY the Ulic Qel Droma who fought in the Great Sith War.

Distance from Core	5,000 light years
Region	Core Worlds
Sector	Alderaan Sector
System	Alderaan system
sun(s)	1
moon(s)	0
Diameter	12500 km
Length Of Year	364 standard days
Length of Day	24 standard hours rotation retrograde
Axial tilt	23°
Major species	Humans, Killiks (c. 1000 BBY)
Population	1.97 billion (before its destruction; 60,000 residents not on the planet at the time of its destruction)
Official language	Basic
Primary terrain	Mountains, Seas, Forests, Plains
Surface water	70%
Points of interest	Aldera (capital), Crevasse City, Castle Lands
Government	Constitutional Monarchy
Affiliation	Galactic Republic, Galactic Empire, Rebel Alliance

Here are the information of Alderann:

The Alderaanian people highly valued education, arts, architecture, poetry, the performing arts, and diplomacy. They placed high value in their participation in the Galactic (later Imperial) Senate. Though largely a democratic society, Alderaan was headed by a hereditary constitutional monarchy, under the historic Royal House of Antillies, and later through marriage the House of Organa presiding over the High Court and legislative High Council of Alderaan. Its monarchs have variously borne the King or Queen of Alderaan. The leader ofAlderaan from the end of Revenge of the Sith to A New Hope was Queen Breha Antilles-Organa.

Queen Breha was married to Bail Organa, who served a term as Senator during the events depicted in Revenge of the Sith, later serving as First Chairman and Viceroy of Alderaan. Traditionally, the heir of the Alderaan throne also serves in the legislative High Council of Alderaan and a term as Senator of Alderaan. Queen Breha and Bail's heir and (secretly adopted) daughter was Princess Leia who was serving as Senator of Alderaan in the Imperial Senate during the events depicted in A New Hope.

As you may know, the planet's history was wiped out by Death Star in Episode IV: A New Hope by the hands of Darth Sidious.