Basilica of St. Achillios, Byzantine basilica in Larissa, Greece

The Basilica of St. Achillios is a mid-6th-century three-aisled basilica with a narthex and exonarthex, excavated in 1978 on the acropolis of Larissa. Only its foundations survive, originally covered by a wooden roof, between the First Ancient Theatre and the Ottoman Bedesten. Graves were found in and around it, including three vaulted tombs.

The church was built in the mid-6th century and dedicated to St. Achilleios, bishop of Larissa for 35 years in the early 4th century. Repaired in the middle Byzantine period, it became the centre of a large cemetery. It is attested until the mid-14th century and was probably demolished when the Ottomans built the Bedesten in the late 15th century. Its foundations were excavated in 1978.

The name honors Saint Achillius, the first bishop of the city, whose veneration shaped local religious life for centuries. Visitors can observe how this place functioned as a burial ground, with graves arranged to reflect the spiritual importance of the saint's presence.

The site sits on Frourio Hill between the Ancient Theatre and the Ottoman-era Bedesten, which helps with orientation. Visitors should wear comfortable shoes since the archaeological remains lie in open areas with uneven ground.

A vaulted tomb at the eastern end of the northern aisle, decorated with crosses, may be the grave of St. Achilleios. The church is attested until the mid-14th century and was probably demolished when the Ottomans built the Bedesten in the late 15th century.