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View of the main fresco on the back wall the dining room (= triclinium) of The House of the Tragic Poet.
This central image is a fresco of Theseus, who had defeated the Minotar on Crete, abandoning Ariadne, who had helped him. Theseus is getting into a ship as he abandons Ariadne, upper left, on the Island of Naxos. A theme of doomed love!