Haadok was a male Vulcan who lived during what was the 9th century BCE. A Vulcan Master, he helped to establish the P'Jem monastery, which stood until its destruction in the mid 22nd century.
Following his death, Haadok was buried in the catacombs underneath the P'Jem monastery. In the mid 22nd century, Haadok's mummified body startled Commander Charles Tucker while he and another Vulcan were in the catacombs. (ENT episode The Andorian Incident).