Vadam is a Sangheili family. They lived in the State of Vadam, a relatively young yet powerful state in Yermo, Sanghelios. Their Kaidon during the Human-Covenant war was Thel 'Vadamee, who would soon be the Supreme Commander of the Fleet of Particular Justice, and later the Arbiter. To gain the honor of having the suffix -ee added to the end of Vadam, the Sangheili would have to have military service. Koida 'Vadam was executed by Thel 'Vadamee because the former sent three assassins to try to kill the new Kaidon.