Lincoln is a cathedral city and the county town of Lincolnshire. It is believed to have been settled as early as the Iron Age (roughly 400 BC-1 AD in Western Europe), with traces of an Iron Age wooden settlement being located in 1972. It was settled once more by the Romans in their invasion of England during the 1st century, and then abandoned roughly four centuries later when the Roman Empire fell. Germanic tribes settled in the area around the city shortly after, but the city itself would not be properly reinstated until William the Conqueror’s arrival in England. It was officially granted its charter in the year 1154.