He defended his country with great perseverance against the Romans, but was at last defeated, and led in triumph to Rome, A.D. 51, after the war, according to Tacitus, had lasted for nine years. Here he was led in triumph before the Emperor Claudius and an assembly of the people. When he came to the seat of the emperor he stopped and addressed him, and so won upon him by his noble behaviour and pathetic speech that he pardoned him. Buchanan, Monipenny, and the other ancient Scottish historians, make this heroic prince one of the Scots monarchs.