Janjur Qom

The San 'Shyuum homeworld was a former Forerunner colony and the homeworld of the San 'Shyuum.

History
Because the San 'Shyuum do not discuss their culture with other races, very little is known of the San 'Shyuum homeworld, such as its name or location, other than that it had very low gravity. What is known is that thousands of years ago, the Forerunners had a large presence on the planet, indicating that it was somehow important to them. During the war with the Flood, the San 'Shyuum were among the races indexed by the Library Project, returning a total of five hundred million after the activation of the Halo Array. The San 'Shyuum came to regard the Forerunners as Gods, and worshiped their technology as gifts left behind for other races. The greatest of these relics was the Dreadnought, a fully functional keyship, possibly the last in the galaxy. Because of the presence of easily accessible Forerunner relics on the planet, the San 'Shyuum advanced faster than most of the other races in the galaxy. However, the San 'Shyuum came to regard the Dreadnought as too holy to explore in depth.

This policy was maintained until 2200 B.C.E., when a group of San 'Shyuum known as the Reformists demanded they be given access to the Dreadnought. This was anathema to the Stoics who maintained the belief of reverence. For the next one hundred years, the San 'Shyuum engaged in internal conflict. The war ended in 2100 B.C.E., when one thousand Reformists barricaded themselves in the Dreadnought. As the Stoics were unwilling to destroy the object they revered, they were indecisive over what to do. This allowed the Reformers to activate the Dreadnought and leave, taking a huge chunk of the planet with them. The Stoics cursed the Reformers to exile, never to return. The Reformists would later go on to be ancestors of those who fought with the Sangheili and become the first Prophets of the Covenant.

While it is unknown if the Prophets ever returned to their homeworld, they did keep tabs on it, and learned that the planet was destroyed when its star collapsed upon itself in 648 B.C.E.. After this, High Charity, a mobile planetoid made out of the chunk or rock and powered by the Dreadnought, became the new homeworld of the San 'Shyuum.