Historical and Archaeological Context

The Historical Context: Demetrius and the Peloponnese

In the context of the Wars of the Successors (Diadochi), the year 303 BC marked a decisive shift in the history of Sikyon. Demetrius Poliorcetes ("the Besieger"), having returned to Greece from the siege of Rhodes in 304 BC, launched a campaign to dismantle the influence of Cassander and Ptolemy in the Peloponnese (Wheatley and Dunn, 2020). Demetrius invoked the rhetoric of the "Freedom of the Greeks" to justify his military interventions.

Early in 303 BC, Demetrius moved against Sikyon, which was then located in the coastal plain and controlled by a garrison of Ptolemy under the command of a general named Philip (Wheatley and Dunn, 2020). Demetrius orchestrated a sophisticated night attack: he utilized a mercenary commander named Diodorus to assault the gates facing Pellene, while simultaneously attacking the harbor with his fleet and another section of the city with his hoplites (Wheatley and Dunn, 2020). The Ptolemaic garrison, overwhelmed, retreated to the acropolis and eventually surrendered, departing for Egypt.

The Refoundation: From Plain to Plateau

Following the capture of the city, Demetrius initiated a radical urban transformation. He determined that the location of the Archaic and Classical city in the coastal plain was vulnerable and difficult to defend. Consequently, he destroyed the lower city and relocated the population to the table-top hill that had served as the city's acropolis, approximately 3.5 km southwest of the coast (Lolos, 2011; Lolos and Gourley, 2011).

This relocation (synoecism) was a major event. Diodorus Siculus recounts that Demetrius assisted with the construction of the new city and restored a free government to the people (Wheatley and Dunn, 2020). In gratitude, the citizens granted him divine honours, annual festivals, and the title of Ctistes (Founder). For a brief period, the city was renamed "Demetrias," though it soon reverted to its ancestral name, Sikyon (Lolos and Gourley, 2011; Wheatley and Dunn, 2020).

Archaeological Context and Urban Planning

The archaeological evidence confirms that the plateau (triangular in shape and naturally defended by the deep gullies of the Asopos and Helisson rivers) became the site of the new Hellenistic city (Lolos and Gourley, 2011). The year 303 BC serves as the terminus post quem for the urban layout visible today.

The City Grid

The new city was laid out according to a strict grid system, utilizing the "Hippodamian" principles of urban planning. Recent extensive geophysical surveys and surface architectural studies have reconstructed a grid oriented along the cardinal points (North-South, East-West), rather than following the terrain (Sarris et al., 2009; Lolos and Gourley, 2011). The city was divided into rectangular residential blocks (insulae) measuring approximately 60 by 65 meters, separated by streets with an average width of 6 meters (Lolos and Gourley, 2011). This regularity suggests a centralized planning authority, likely a board appointed to oversee the layout of streets and the allocation of land, similar to practices seen in other Macedonian foundations (Lolos and Gourley, 2011).

Fortifications

Concurrent with the layout of the streets was the construction of a massive fortification wall along the edge of the plateau. Survey work has mapped approximately 200 meters of these walls, identifying seven gates (Lolos and Gourley, 2011). Excavations at the northeastern corner of the plateau revealed sections of the wall built in isodomic masonry with rectangular towers (Lolos and Gourley, 2011).

The Agora and Public Buildings

A vast area, estimated to be between 37,000 and 59,000 square metres, was reserved for the Agora, making it one of the largest in the Hellenistic world (Lolos and Gourley, 2011). While the grand public buildings such as the Bouleuterion, the Gymnasium, and the Theater define the civic center today, their exact dating in relation to 303 BC varies.

The Theater and Stadium

These were carved partly out of the bedrock and are central to the new city plan (Lolos, 2011).

The Long Stoa

Located east of the Bouleuterion, this stoa was traditionally attributed to Demetrius due to its size and location. However, recent excavations in the stoa's foundations recovered pottery dating to 275–265 BC, suggesting it may have been constructed a few decades after the refoundation, potentially challenging the direct architectural attribution to Demetrius himself (Lolos, 2013).

Domestic and Industrial Activity

The plateau was zoned for different activities. While the upper plateau (the western apex) appears to have been used for agriculture or pasturage, the lower plateau hosted the residential and civic quarters (Sarris et al., 2009). Excavations have also revealed industrial areas, such as pottery workshops with kilns operating in the southeast of the city during the Hellenistic and Roman periods (Lolos, 2019). Additionally, excavation of a well in the western part of the Agora ("Western Stoa") provided pottery dating to the late Hellenistic period, confirming the commercial use of the area subsequent to the city's foundation (Lolos, 2020).