The translatio or traslatio, is a Latin term that gives name to the legendary translation by sea of the body of the Apostle Santiago O Maior, from the city of Palestine to Galicia, where he was buried, thus giving meaning to the discovery. of his grave and his remains in the current city of Compostela around the years 820-830.
The Route of the Sea of Arousa and Ulla River is a unique maritime and fluvial itinerary that commemorates the arrival in Galicia, by sea, of the body of the Apostle Santiago after his martyrdom in Jerusalem, around the year 44. The ports of Ribeira and O Grove they mark the entrance to the Arousa estuary, through whose waters the apostle's boat sailed its last kilometers.
Ancient Christian traditions and several medieval texts -the most important of them, Book III of the Calixtinus Codex- say that the body of Santiago, accompanied by his disciples Teodoro and Atanasio, entered the Arousa estuary and went up the Ulla river to Padrón, the river port of the Roman city of Iria Flavia. He arrived in a stone ship, probably referring to one of the ships that, at that time, was transporting minerals from Galicia to other parts of the Roman Empire.
Source: caminodesantiago.gal