Around 640, the Avar-Slavic party raided the city of Salona on Dalmatian Adriatic coast, capturing Christian residents and numerous religious artifacts, including relics of the Saint Domnius and Saint Venantius of Salona. Pope John IV sent abbot Martin to buy off the prisoners and relics, whose account on the event survived. At the same time, citizens of the neighboring Spalatum complained to the "emperors in Constantinople" (Heraclius and his son Heraklonas) about the constant harassment by the Slavs, which prompted the emperors to issue an order to the "Goths and Slavs" to leave the town alone, which they complied to. The 8th century "History of the Lombards" by Paul the Deacon tells about the Slavic flotilla which attacked the town of Sipont in Italy in 642 (or 646). The Slavs arrived with "many ships", landed on the Gargano Promontory, close to Sipont, where they set their tent camp. They confronted the Lombards' duke Aiulf I, killing him. They were then approached by the Aiulf's adopted younger brother Radoald who "spoke their language", confusing the Slavs long enough to defeat them and expel them from the Apennine Peninsula.