HEIRESS. A female heir to a person having an estate of inheritance. When there is more than one, they are called co-heiresses, or co-heirs. HEPTARCHY, Eng. law. The name of the kingdom or government established by the Saxons, on their establishment in Britain so called because it was composed of seven kingdoms, namely, Kent, Essex, Sussex, Wessex, East Anglia, Mercia, and Northumberland.