938 BCE

In 938 BCE the San'Shyuum first encounter the Sangheili on their frontier world of Ulgethon. Like the Stoics, the Sangheili believe that Forerunner relics are to be worshipped, not modified. The San'Shyuum attempted diplomacy with the Sangheili by sending a delegation to explain that they, too, worshiped the Forerunners. Led by an Arbiter, the Sangheili resisted their entreatment and summarily executed the delegation, sparking San'Shyuum-Sangheili War.