The Early Christian Tetraconch – Basilica of Megali Panagia (Παλαιοχριστιανικό Τετράκογχο - Βασιλική Μεγάλης Παναγίας) is one of the most notable early Christian monuments in Athens, located directly adjacent to Monastiraki Square in the heart of the city. The basilica is part of the wider archaeological zone that includes Monastiraki, the Library of Hadrian, the Roman Agora, and the Ancient Agora.
Dating back to the late 5th or early 6th century AD, the church is considered one of the earliest Christian places of worship integrated into the urban fabric of Athens. Its defining feature is its tetraconch design — a cross-shaped layout with four symmetrically arranged apses, indicating an important liturgical role, possibly as a martyrium or baptistery.
Today, visitors can observe remains of the foundation, mosaics, columns, and apse structures, partially incorporated into the modern streetscape of Monastiraki. Despite its ruined state, the layout remains clearly visible, and the site is accompanied by informational signage for historical context.
The ruins of the Basilica of Megali Panagia are located near the busy Pandrosou and Adrianou streets, just steps away from the Monastiraki metro station and numerous tourist attractions. It is a place where layers of history — from ancient to Byzantine — merge seamlessly with modern urban life.
The Basilica of Megali Panagia is a compelling site where spirituality, early Christian architecture, and vibrant city culture intersect, making it a key stop on cultural and archaeological tours of Athens.