Hertford, town (1991 pop. 21,350), E central England, on the Lea River. Hertford is an agricultural market with light industries, including brewing, flour milling, and the manufacture of leather goods and stationery. It was important even in Saxon times; there, in 672, the archbishop of Canterbury convened the first national church council. Near Hertford is one of England's leading schools, Haileybury College, founded in 1862. The school merged with the Imperial Service College in 1942.