There is no room to doubt that the monument described by Zen was the group of the Lion and the Bull, described, before him, by Anna Comnena and Zonaras.[1003] His description might be a translation of the account given of the group by those writers. Nor is there any uncertainty as to the locality where Zen saw the monument. He indicates the site with a redundancy which makes misunderstanding simply impossible, and for which he may be pardoned, since minute particularity seldom distinguishes the statements of authorities on the topography of the city. According to the Venetian envoy, the monument stood on the quay outside the water-gate named Tchatlady Kapou, which was a gate below the Hippodrome, and near a slaughter-house. The group stood, he adds, beneath a row of three windows, adorned with a lion at either end, belonging to a very ancient building. [Illustration: Marble Figures of Lions Attached to the Balcony in the Palace of the Bucoleon.] Now, the gate to which the name Tchatlady pertains is a matter of public notoriety, and every particular by which Zen marks the entrance he had in mind holds good of that gate. It is near the Hippodrome, and on the level ground below the race-course. On the western headland of the little bay in front of it, is an old slaughter-house, by which Leunclavius, likewise, identifies the gate Tchatlady Kapou, and from which he derived the name of the entrance;[1004] while to the east of the gate stood, until recent times, a Byzantine palace, in the façade of which was a row of three windows, supported at either end by the figure of a lion. The palace is thus described by Leunclavius: “This gate (Tchatlady Kapou) has on one side of it the marble-framed windows of an ancient building or palace, which rests upon the city walls themselves.”[1005] Gyllius refers to it in the following terms: “Below the Hippodrome towards the south is the Gate of the Marble Lion, which stands without the city among the ruins of the Palace of Leo Marcellus. The windows of the palace are of ancient workmanship, and are in the city wall.”[1006] Choiseul-Gouffier[1007] gives a view of the palace as seen in his day, and so does Canon Curtis, in his _Broken Bits of Byzantium_. The façade was torn down in 1871, and the lions have been placed at the foot of the steps leading to the Imperial School of Art, within the Seraglio enclosure.[1008] With this evidence as regards the site of the group of the Lion and the Bull, it is impossible to doubt that the Harbour of the Bucoleon was in the little bay before Tchatlady Kapou. And with this conclusion every statement made by Byzantine writers regarding the harbour will be found to agree. [Illustration: Ruins of the Palace of the Bucoleon.[1009]]