Joel
The Temple of the Acts of Joel was originally a Temple ship. However, it was decommissioned in <date>1824</date> after becoming infected with a dangerous pathogen known as Phobos. The crew evacuated, and the computer systems were set to fly into deep space.
When the derelict designated with Temple Code ZZF was discovered, it was investigated for salvage, and then left for several years before it was discovered to be the remains of Joel.