Master Haadok was one of the founders of the ancient Vulcan monastery P'Jem in the 9th century BC. His mummified remains were kept within the catacombs beneath the monastery.
Haadok's remains startled Commander Tucker while he and a Vulcan were making their way through the catacombs. (ENT: "The Andorian Incident")
In the script of "The Andorian Incident", the mummified remains of Haadok were described as "a Vulcan mummy! Desiccated, ancient, wearing tattered robes."