Byzantine shipwreck off Croatia’s Mljet reveals 600 g gold, imperial ring

Underwater archaeologists have been exploring a 7th‑8th‑century Byzantine shipwreck off the island of Mljet in the Adriatic since 2015. The vessel, dated to the late seventh or early eighth century, sank at a depth of about 30 m and was part of a major maritime route linking east and west Mediterranean.

The wreck yielded more than 40 gold objects weighing roughly 600 g, including four ornate gold belt sets, a gold buckle studded with emeralds, rubies and pearls, and a gold signet ring bearing the image of an emperor. Gold coins of four Heraclean‑dynasty emperors and a gold ring with a ruler’s likeness confirm the cargo’s imperial nature. Accompanying artefacts such as amphorae, ceramic wares, scales, ivory gaming pieces and dice illustrate the broader trade network of the Byzantine Empire.

Researchers Igor Miholjek and Pavle Dugonjić say the treasure indicates the ship was carrying a high‑ranking dignitary rather than ordinary commercial goods. The find is described as the largest gold cargo ever recovered from a Mediterranean shipwreck and provides new insight into late Roman‑Byzantine trade and diplomacy. Plans are under way for a major exhibition, a catalogue, and a documentary film on the discovery.