Kratocracy, from (Gr. krateros, strong), is according to Montague, government by those who are strong enough to seize power through force or cunning. The term was also used by Kropotkin in Mutual Aid: A Factor of Evolution, but is now rarely seen.
It is technically the most basic type of governing body, proven to have gone back right to the original human Tribes. It is from this simple philosophy of Authority of the fittest that other forms of government have stemmed.