Written history began in Britain when writing was brought to Britain by the Romans. Rome ruled in Britain from 44 to 410. They ruled the southern two-thirds of Great Britain. The Romans never took over Ireland and never fully controlled Caledonia, the land north of the valleys of the River Forth and River Clyde. Their northern border varied from time to time, and was marked sometimes at Hadrian's Wall (in modern England), sometimes at the Antonine Wall (in modern Scotland).