The Church of St. Pancras is situated near Babino Polje, in the Island of Mljet. It is dedicated to a one-time patron of the island, a 4th century martyr from Phrygia, who was killed in Rome in 304 AD during Christian prosecutions, under Emperor Diocletian (ruled 284-305).
The Church is a single nave building, dimensions 4x2m, with an apse on its Eastern end which is semicircular on the inside and rectangular on the outside. The naos was divided into two bays by the opposing, wide pilasters joined by an arch that strengthened the barrel vault.
The Church was probably built in the 11th century, and today is left in ruins. In the 12th century it fell into the hands of the Benedictines. At that time, Babino Polje became the administrative and ecclesiastical center of the whole island.