Walls of Thessaloniki
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The ancient city was organized and evolved within its fortifications which acted not only as the main line of defense against hostile attacks, but also as the conventional boundary between the town and the surrounding agricultural area.
The imposing late 4th century AD fortifications of Thessaloniki incorporated the earlier defense wall dating from the middle of the 3rd century AD, which it used as a buttress. This latter wall had been built hastily, using earlier architectural material, to protect the city from the raids of the Goths. The new walls had the shape of a trapezium and were about 8 km long. In the lower, more vulnerable section of the city, they were strengthened by an outwork and had stout triangular bulwarks placed at frequent intervals. Towers were built on the slopes of the hill, most of them rectangular. Triangular bulwarks alternated with rectangular towers at the most sensitive within it points of the Acropolis. On the side facing the sea, the city was protected by the sea wall, which also incorporated architectural members taken from the late Roman buildings in the Agora, probably for use in repairs made after the earthquakes of 620-630. This wall was low, and its outer face stood in the sea, and during the siege of Thessaloniki by the Saracens in 904, the general Petronios therefore planned to construct a submarine barrier by throwing sarcophagi and funerary stelai into the sea in front of the sea wall. The plan was not brought to completion, however, and the Saracens entered the city from the sea. The sea wall was later reinforced, before the siege of Thessaloniki by the Normans. 
At the south-west end of the sea wall was the large artificial harbor that was constructed by Constantine during his stay in Thessaloniki (322-323). The harbor was protected by a breakwater, referred to as molos in the 7th century and later as the tzeremboulo. There was a second, natural harbor called Kellarion on the east coast of the Thermaic Gulf. 
The Acropolis was appended to the exterior of the north-east section of the enceinte, and followed the general arrangement of the fortifications in the lower city, with alternating rectangular towers and defensive triangular bulwarks at its most vulnerable points. Evidence that the Acropolis was a later addition is furnished by the orientation of the towers on the dividing wall: these faced the interior of the Acropolis on what was originally the outer face of the city fortification wall. Inside the Acropolis there is a large cistern in the south-east section which was used for the city's water supply. On the north edge of the perimeter wall is the Fortress of the Heptapyrgion, to the south of which an Early Christian basilica has been excavated. 
The city has four main entrances: two Gates in each of the east and west walls, set at the ends of the two parallel main streets. The entrance to Thessaloniki from the west was via the Golden Gate, from which ran the main street of the city, the Via Regia of the Roman period, called Leophoros by the Byzantines, which lies beneath the modern Egnatia Street. The second gate at the west was the Letaia Gate, standing on the western extension of the modern Ayiou Dimitriou Street, beneath which ran a second ancient artery. In the east wall we know of the Cassandreia Gate (later the Kalamaria Gate) to which the Leophoros led, the New Golden Gate at the east end of Ayiou Dimitriou Street, and two other gates, the Asomatoi Gate and the Rome Gate. Smaller gates in the north wall of the city mainly served military needs. The Acropolis communicated with the city through a large gateway in the dividing wall, according to the Byzantine authors. Finally, there were two smaller gates in the Acropolis enceinte, communicating with the countryside. 
Large towers and forts acted as nodal points in the perimeter of the walls. Their present form is the outcome of major works undertaken by the Turks after the capture of the city to strengthen its fortifications and adapt them to the new requirements of artillery warfare. At the east end of the sea wall, where it joins the east wall, stands the White Tower, probably on the site of the 'eastern tower by the sea' mentioned by Byzantine authors.
Sultan Suleiman the Magnificent (1520-1566) built the Vardari Fort at the south-west edge of the enceinte, to protect the west side of the harbor. The east section of the perimeter wall of this fortress incorporated part of the west wall of the Early Christian period. At the north end of the east wall is the Chain Tower. In the 15th century this tower replaced the Byzantine Trigonion Tower, which was incorporated in its structure; before the eighteenth century, it was used as a gunpowder magazine and arsenal. 
At the end of the 19th century, the sea wall began gradually to be demolished, followed by large sections of the land walls in the lower, flat area of the city. The surviving fortifications, however, a length of almost 4 km, including the Acropolis and the Heptapyrgion, form an imposing complex. The line of the sea wall is being uncovered by excavations.

Inscriptions in the fortifications allow us to trace their history through the modifications and remodeling recorded in them.
An inscription in bricks in a tower of the east wall states that "with unbreachable walls Hormisdas fortified this great city, having clean hands". If it is accepted that the expression 'having clean hands' is a reference to the massacre of the citizens of Thessaloniki in the Hippodrome, ordered by Theodosius the Great in 390, the Hormisdas of this inscription is perhaps to be identified with the commander of a Balkan detachment of that name who is mentioned by the historian Zosimos. In this case, AD 390 will furnish a terminus post quem for the construction of the fortifications. Over the following centuries, earthquakes and enemy attacks created a need for frequent repairs and modifications to the structure, visible in the masonry and attested in inscriptions. None of these works, however, altered the original layout or form of the fortifications. 
An inscription built into the southernmost tower in the west wall refers to a renewal of the tower dating to 862: "In the time of Marinos, the royal protospatharios, this tower was renewed under the supervision of Kakikis, the royal strator, in the year 6370 from the founding of the world, of indiction 10th." 

The siege and capture of Thessaloniki by the Saracens in 904 is the context for an inscription found in the ruins of the sea wall (now in the Museum of Byzantine Culture): "Renewed under Leo and Alexander, natural brothers and emperors, and our Christian rulers, and under Nikolaos, our ecumenical patriarch. Renewed under Leo, royal protospatharios and Chitzilakis, general of Thessaloniki, and under John, Archbishop of Thessaloniki." 
wo inscriptions in a tower at the south-west junction between the Acropolis and the fortification walls refer to a major intervention in the defenses during the 12th century: "Tower of the most reverend, reverend and great chartoularios, Master Andronikos Lapardas" and "the most humble Michael Prosouch, servant of Michael Lapardas." The names recorded in these inscriptions are known in the prosopography of the period of the Komninoi (c.1167). 

Further work in this same period is mentioned by an inscription in one of the Acropolis towers, outside the Heptapyrgion: "This is the work of Basil, the Metropolitan of indiction 8th." The metropolitan bishop Basil is to be identified with Basil of Ohrid, Metropolitan of Thessaloniki (1145-69). 

The inscription of Hyaleos, logothete tau stratiotikou (now at Istanbul Archaeological Museum), refers to a repair of the sea wall in 1316: "This ... of the wall was built from the foundations through the contribution and cooperation of the most reverend logothete tou stratiotikou Hyaleos, governor of this city of Thessaloniki in the year 6824, of indiction 14th."
The monogram of Andronikos Palaiologos on a tower in the dividing wall between the Acropolis and the city presumably refers to a repair made by Andronikos III Palaiologos (1328-41), who is known to have been connected with Thessaloniki. Anna Palaiologina, too, the wife of Andronikos III, who herself had connections with Thessaloniki and stayed there for a long interval, built a gate at the south-east corner of the enceinte, at its junction with the Acropolis, to the west of the Trigonion Tower. The marble pilaster of this gate has the following inscription (1355-56): "The present gate was erected at the orders of the almighty and holy mistress and lady, Mistress Anna Palaiologina, when Ioannis Chamaetos, quaestor, was guardian of the fortress, in the year 6864, of indiction 9th." 
Finally, a repair of the walls is mentioned in an inscription of Manuel II Palaiologos on a tower at the north edge of the wall, presumably dating from his stay in Thessaloniki as Despot (1369-73): "By the strength of Manuel, our mighty Despot, this tower was erected from the foundations’ in this wall by duke Georgios Apokaukos. By the strength of Manuel the mighty."

ΤΕΙΧΕΣΙΝ ΑΡΡΗΚΤΟΙΣ ΟΡΜΙΣΔΑΣ ΕΞΕΤΕΛΕΣΕΝ ΤΗN ΔΕ ΠΟΛΙΝ….

With unbreachable walls Hormisdas fortified this great city, having clean hands

ΑΝΗΓΕΡΘΗ Η ΠΑΡΟΥΣΑ ΠΥΛΗ ΟΡΙΣΜΟ ΤΗΣ ΚΡΑΤΑΙΑΣ ΚΑΙ ΑΓΙΑΣ ΗΜΩΝ ΚΥΡΙΑΣ ΚΑΙ ΔΕΣΠΟΙΝΗΣ ΚΥΡΑΣ ΑΝΝΗΣ ΤΗΣ ΠΑΛΑΙΟΛΟΓΙΝΗΣ ΥΠΗΡΕΤΗΣΑΝΤΟΣ ΚΑΣΤΡΟΦΥΛΑΚΟΣ ΙΩΑΝΝΟΥ ΧΑΜΑΕΤΟΥ ΤΟΥ ΚΟΙΑΙΣΤΟΡΟΣ ΤΩ ΣΩΞΔ ΕΤΕΙ ΙΝΔΙΚΤΙΩΝΙ Θ.
The present gate was erected at the orders of the almighty and holy mistress and lady, Mistress Anna Palaiologina, when Ioannis Chamaetos, quaestor, was guardian of the fortress, in the year 6864, of indiction 9th.

Inscriptions of Andronikos Lapardas and Michael Lapardas on a tower on the northern wall

Source

Wandering in Byzantine Thessaloniki by E. Kourkoutidou-Nikolaidou 

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