In the christian catacombs, cubicula served as

The cubicula serves as a mortuary chapels. Cubicula is also known as a catacombs. Cubiculums are a room where it is also used during worship in the Roman times. Cubiculum means bedroom in Latin. It is also a place where a specific family is laid to rest which makes it as a family vault. 

i remember this

i was off to a good start

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it would usually depend on the genre that they would provide