Myth. The painted ceiling shows the god Dionysus and the princess Ariadne.
People told this story.
The ceiling was in an upstairs dining room in the House with Bakery, in Regio IX of Pompeii. It was painted before Mount Vesuvius erupted in AD 79. The ceiling fell and broke into more than a thousand pieces. Experts have put more than a quarter of it back together on a new curved frame, shaped like the old arched ceiling. In the old story, Dionysus, the god of wine, married Ariadne, a princess from Crete. In the painting, Dionysus leans back on a chariot pulled by two centaurs playing music. Ariadne faces him and plays a harp. Around them are garlands of fruit and flowers, figures for the seasons, and theatre masks. The house belonged to a rich Pompeii official named Aulus Rustius Verus. Many more pieces are still in storage, and they can be added later.
Only part of the middle scene is left. Experts named it by comparing it with other old paintings.
https://www.ancient-origins.net/news-history-archaeology/pompeii-fresco-restoration-00103024