Most of the kingdoms of the Heptarchy are included. This led to waves of settlers who eventually established seven kingdoms, known as the heptarchy. Arms were attributed to the kingdoms of the Anglo-Saxon heptarchy. Mercia (; ; ) was one of the kingdoms of the Anglo-Saxon Heptarchy. The kingdom was one of the seven traditional members of the Anglo-Saxon Heptarchy. A heptarchy of new kingdoms began to emerge. The remaining kingdom of Wessex was the only kingdom of the Heptarchy left. Around 600, seven principal kingdoms had emerged, beginning the so-called period of the Heptarchy. Brill Palace was founded during the Heptarchy and was used by Edward the Confessor.