Siam

Siam is the largest and 7th and Penultimate Planet of the Siam System, final if one doesn't count Hydra. It is the only Gas Giant of the Solar System, and is also the planet for which the System is named after. It was the primary focus of several UNSC (and Covenant) expeditions into the system, namely involving the UNSC Sanctuary of Spring. It is under Yagnyar control.
==Encounters with Siam==
The first time UNSC encountered Siam was when the UNSC Sanctuary of Spring was on it's journey in 2532.The third goal was heading to the Gas Giant. This System however was being taken by Covenant at the time who had just discovered it as the Humans had no Colony present in the system. The Target was apparently on the Gas Giant itself, and as such the Sanctuary of Spring and the Covenant forces collided with each-other. Only a small Covenant Corvette was present alongside a small amount of Drop-ships. The Battle was quick, and ended in a UNSC Victory thanks to Robertson having the first strikes and being able to deploy VTOL forces and fire the most powerful weapons quickly onto the enemy ship. Soon enough, they found what they were looking for, it was the floating remains of a desolate Synthetic ship that was floating in the gas. After searching the ship they found the way to get into the Galactic core, and continued onto their Journey (see UNSC Sanctuary of Spring for further coverage).
The second encounter with Siam was in 2534 when the UNSC King Arthur with the new President of the UEG (of the time) on-board as a moon near the Gas Giant Siam, specifically the moon Delta, was finally decided to be colonized. With the Sanctuary of Spring helping it, both ships headed towards their goal of Delta. Unfortunately, an unidentified ship entered the system, the same kind of shape encountered in 2532 on the Gas Giant, and attacked both ships with firepower they could not match. The King Arthur was destroyed, but Robertson and the spring managed to save the President and return him to Earth safely. Siam was no longer desired to be near a colony at all.
The third engagement was the brief Battle of Siam in 2535 in-order to find out what had destroyed the UNSC King Arthur. This battle was primarily between Synthetics and Covenant, in which the Synthetics were winning. Once UNSC forces arrived, the Synthetics still managed to seal in their victory. The Sanctuary of Spring did survive the battle.
==Trivia==
*Siam is the original name of Thailand.
*The Planet is the Seventh planet of it's system, and has seven moons.
*It has the most encounters of any planet in it's system.