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Portrait of the four tetrarchs

porphyry sculpture group of four Roman emperors outside the St Mark's Basilica in Venice, Italy

Pronunciation
/ˈpɔːtrət əv ðɪ fɔː ˈtɛtrɑːks/
/ˈpɔrˌtreɪt əv ðə fɔr ˈtɛtrɑrks/