Immediately behind the Chalke Gate, facing southwards, were the barracks of the palace guards, the Scholae Palatinae. After the barracks stood the reception hall of the 19 Accubita ("Nineteen Couches"), followed by the Palace of Daphne, in early Byzantine times the main imperial residence. It included the Octagon, the emperor's bedchamber. From the Daphne, a passage led directly to the imperial box ("kathisma") in the Hippodrome. The main throne room was the Chrysotriklinos, built by Justin II, and expanded and renovated by Basil I, with the palatine chapel of the Theotokos of the Pharos nearby. To its north lay the Triconchos palace, built by the emperor Theophilos and accessible through a semicircular antechamber known as the Sigma. To the east of the Triconchos lay the lavishly decorated "Nea Ekklesia" ("New Church"), built by Basil I, with five gilded domes. The church survived until after the Ottoman conquest. It was used as a gunpowder magazine and exploded when it was struck by lightning in 1490. Between the church and the sea walls lay the polo field of the "Tzykanisterion".