Creshen

Ulgethon is a Sangheili colony world, and former manufacturing center for the Covenant Empire.

History
When the Reformist faction of San'Shyuum arrived on the planet of Ulgethon at 938 BCE they managed to make contact with the local Sangheili colonists. The disaster that was first contact led to a war the spanned the Sangheili empire, and would last for several decades.

The Covenant
When the Writ of Union was written and the two species declared peace, Ulgethon became a population center and a major manufacturing site for the Covenants war machine. A tradition which was followed up until the onset of the Great Schism when the prophets expelled the Sangheili from the Covenant.