History
Sacrosanct was the homeworld of the Universal Church of Truth.[1] Also known as G5 Deneb, it had been the Church's homeworld for sixteen years and was the Church's fifth homeworld in as many decades.[2]
The cocoon in which Adam Warlock had placed Thanos had been found by the UCT who believed that it contain their messiah.[3] The cocoon was kept on Sacrosanct[4] until it was opened by Martyr and a resurrected Thanos was released from it.[5] Soon after that resurrection, the planet had been depopulated of its billions of inhabitants, all of whom had either been killed by Thanos or had fled to escape him.[6]