The church was constructed specifically to house the relics of Saint Achillius, the Bishop of Larissa, seized by Tsar Samuel in 986 AD.
The basilica is one of the largest in the Balkans from the late 10th century, measuring approximately 30 meters in length.
The island of Agios Achillios, where the basilica stands, is connected to the shore by a 650-meter long floating pedestrian bridge.
The site was excavated in 1969 by the Greek archaeologist Nikolaos Moutsopoulos.
Tsar Samuel's tomb was identified by researchers within the sanctuary area of the basilica during the late 20th-century excavations.
The Basilica of Saint Achillius is a 10th-century Byzantine ruins complex situated on the island of Agios Achillios within Lake Prespa, Greece. Built by Tsar Samuel of Bulgaria, the cathedral was designed to house the relics of Saint Achillius, which were transported from Larissa. It is a three-aisled basilica characterized by its massive stone construction and extensive use of local materials. The site remains partially excavated, revealing internal floor plans and masonry techniques from the First Bulgarian Empire. It stands as a significant archaeological monument in the Prespa National Park region, reflecting the historical cross-cultural influences of the Balkans. The remains are exposed to the elements on the island, reachable only via a pedestrian footbridge.
The elevated vantage point from the trail leading up to the ruins, framing the stone arches against the backdrop of the lake.
Wear sturdy walking shoes, as the path from the bridge to the ruins is unpaved and can be uneven.
Carry sun protection, as there is zero shade once you reach the open-air archaeological site.
Bring binoculars for birdwatching, as the surrounding Prespa lakes are a major habitat for Dalmatian pelicans.
Do not attempt to walk on the ice if visiting during winter, as the lake conditions are unpredictable.
The site is typically inaccessible during severe winter weather due to high winds and icy conditions on the bridge.
Respect the archaeological perimeter; do not climb on the stone masonry or remove any rock fragments.
