Generalissimo

Generalissimo (Italian), Generalísimo (Spanish), and Generalissimus are military ranks of the highest degree, superior to Field Marshal and other five-star ranks.

Usage
The word "generalissimo" is an Italian term, from generale, plus the superlative suffix -issimo, itself from Latin -issimus,    meaning "utmost, to the highest grade".

Historically this rank was given to a military officer leading an entire army or the entire armed forces of a nation, usually only subordinate to the sovereign. Other usage of the rank has been for the commander of the united armies of several allied powers.

In popular culture
"Generalissimo Francisco Franco is still dead" was an oft repeated catch phrase from the newscast hosted by Chevy Chase on NBC's Saturday Night the first season title of what became Saturday Night Live