What is the highest level of taxonomy?

A way to remember them is:

Kings Play Chess On Fine Green Squares (Kingdom, Phylum, Class, Order, Family, Genus, Species)

Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species is the actual order, but domain was added later. The seven not including Domain were the original levels. or you could say Donkey Kong puts coconuts on funky gorilla salads cuz domian kingdom phylum order family genus species