this gate to at least 1542. The gate is richly decorated with religious inscriptions and monograms of sultans. Passage through the gate was tightly controlled and all visitors had to dismount, since only the sultan was allowed to enter the gate on horseback. This was also a Byzantine tradition taken from the Chalke Gate of the Great Palace. The Fountain of the Executioner (Cellat Çeşmesi) is where the executioner purportedly washed his hands and sword after a decapitation, though there is disagreement about whether the fountain was actually used for this purpose. It is located on the right side when facing the Gate of Salutation from the First Courtyard. In April 2021, archaeologists uncovered a Roman period gallery consisting of three sections during the underground researches carried out in Topkapı Palace. The gallery located near the Imperial Gate was revealed during the excavation of the First Courtyard. Second Courtyard Through the middle gate is the Second Courtyard (II. Avlu), or Divan Square (Divan Meydanı). The courtyard was probably completed around 1465, during the reign of Mehmed II. It received its final appearance around 1525–1529 during the reign of Suleyman I. It is surrounded by the former palace hospital, bakery, Janissary quarters, stables, the imperial harem and Divan to the north and the kitchens to the south. At the end of the courtyard, the Gate of Felicity marks the entrance to the Third Courtyard. Numerous artifacts from the Roman and Byzantine periods that have been found on the palace site during recent excavations, including sarcophagi, are on display in the Second Courtyard in front of the imperial kitchens. Located underneath the Second Courtyard is a cistern that dates to Byzantine times. During Ottoman times this courtyard would have been full of peacocks and gazelles. It was used as a gathering place for courtiers. The Sultan, seated on the gold-plated Bayram throne, used to hold audiences in the second courtyard. Some foreign dignitaries, including the French ambassador Philippe du Fresne-Canaye, have written accounts about these audiences. The imperial stables (Istabl-ı Âmire), located around five to six meters below ground level, were constructed under Mehmed II and renovated under Suleyman. A vast collection of harness "treasures" (Raht Hazinesi) are kept in the privy stables. This area also has a small 18th-century mosque and the bath of Beşir Ağa (Beşir Ağa Camii ve Hamamı), who was the chief black eunuch of Mahmud I. At