The Kingdom of the East Saxons (), was also called the Kingdom of Essex. It was one of the seven kingdoms of the Anglo-Saxon Heptarchy. Essex was founded in the 6th century. The kingdom of Essex covered the area of the modern English counties of Essex, Hertfordshire, Middlesex and (for a short while) Kent. Kings of Essex frequently found themselves under the control of other Anglo-Saxon overlords. The territory of the East Saxons included the two Roman provincial capitals of Colchester and, for a time, London. In the Tribal Hidage the East Saxons were listed at 7,000 hides.