 Britain was the home of Pelagius, who opposed Augustine of Hippo's doctrine of original sin; St Germanus was said to have visited the island in part to oppose the bishops who advocated his heresy.Around 367, the Great Conspiracy saw the troops along Hadrian's Wall mutiny, allowing the Picts to overrun the northern areas of Roman Britain (in some cases joining in), in concert with Irish and Saxon attacks on the coast.The Roman provinces seem to have been retaken by Theodosius the Elder the next year, but many Romano-Britons had already been killed or taken as slaves.