Dogmatic Sarcophagus
The Dogmatic Sarcophagus , also known as the "Trinity Sarcophagus" is an early Christian sarcophagus dating to 320–350 , now in the Vatican Museums ( Vatican 104 ) . 
<triplet> Dogmatic Sarcophagus <subj> sarcophagus <obj> instance of <subj> Vatican Museums <obj> collection