Vulcan monastery planet

From Memory Alpha, the free Star Trek reference.

This planet, between the neighboring Vulcan and Andorian systems, was the site of the P'Jem monastery.

The planet was known to the Vulcans since at least the early 1st millennium BC. The construction there of P'Jem, later consecrated to the memory and teachings of Surak, predated the Time of Awakening by over twelve centuries.

In the 22nd century the Vulcan High Command thought to capitalize on the planet's proximity to the Andorian homeworld by installing a massive long-range sensor array there. The ancient monastery provided cover for this spy station.

Certain Andorian factions remained suspicious even after the peace treaty with the Vulcans. Imperial Guard commandos forcibly searched P'Jem twice before the successful 2151 raid led by Thy'lek Shran. Within a year the spy station and its ancient cover had been destroyed. (ENT: "The Andorian Incident", "Shadows of P'Jem")

The planet was, perhaps more importantly, the site of the first association of Andorians and Humans, in the persons of Shran and Jonathan Archer. Their grudging partnership was to play no small part in bringing about the UFP Charter ten years later.