The city of Oxford is the county town of Oxfordshire, England. The city, made prominent by its medieval university, has a population of just under 165,000, with 153,900 living within the district boundary. It lies about 50 miles (80 km) north-west of London.
The rivers Cherwell and Thames run through Oxford and meet south of the city centre. For a distance of some 10 miles (16 km) along the river, in the vicinity of Oxford, the Thames is known as the Isis. Oxford was first settled in Saxon times, and was initially known as "Oxenaforda", meaning "Ford of the Oxen"; fords were more common than bridges at that time. It began with the foundation of an oxen crossing in the early 900 AD period. In the 10th century Oxford became an important military frontier town between the kingdoms of Mercia and Wessex and was on several occasions raided by Danes.