octarchy noun. 
['ɒktɑ:ki] L18.[from OCTA- + -ARCHY, after HEPTARCHY.]Government by eight rulers; an aggregate of eight districts or kingdoms, each under its own ruler; 
spec. the supposed eight kingdoms of the Angles and Saxons in Britain in the 7th and 8th cents. Cf. 
HEPTARCHY. 
 [TahlilGaran] English Dictionary ▲