This is the atrium of a small "house" off the west side of the Peristyle Courtyard. Note the impluvium to catch the rainwater and the detailed black and white mosaic with details of 2 dolphins and a trident, etc. Also, the columns were made out of curved bricks and plastered over.
The House of Menander is located to the southeast of the Roman Forum of Pompeii. It is one of the largest and most opulent houses of Pompeii (19,000 sq ft.). A personal seal and graffiti indicate that Quintus Poppaeus Sabinus was its owner. He was a relative of the Empress Poppea Sabina, Nero's second wife. Its name comes from a fresco of a famous Greek dramatist, Menander found on one of the walls.
Regio I, Insula X.4 (= Region 1, Block 10, Doorway 4 [plus others]) — Room 46.