
commander of four files.
Found on
http://s_van_dorst.tripod.com/Ancient_Warfare/Greece/greek_glossary.html

• (a.) A Roman governor of the fourth part of a province; hence, any subordinate or dependent prince; also, a petty king or sovereign. • (a.) Four.
Found on
http://thinkexist.com/dictionary/meaning/tetrarch/

in Greco-Roman antiquity, the ruler of a principality; originally the ruler of one-quarter of a region or province. The term was first used to denote ... [3 related articles]
Found on
http://www.britannica.com/eb/a-z/t/30
Te'trarch adjective Four. [ Obsolete]
Fuller. Found on
http://www.encyclo.co.uk/webster/T/35
Te'trarch noun [ Latin
tetrarches , Greek ..., ...;
te`tra- (see
Tetra- ) + ... a ruler, ... to lead; rule: confer French
tétrarque . See
Arch ,
adjective ]
(Rom. Antiq.) A Roman governor of the fourth part of a province; hence, a...
Found on
http://www.encyclo.co.uk/webster/T/35

A tetrarch was originally a ruler of one of four parts of a region. Over time the word tetrarch came to lose its original meaning and was applied to minor rulers generally, especially to the princes of Syria under the Roman emperors.
Found on
http://www.probertencyclopaedia.com/browse/AT.HTM

HMS Tetrarch was a British Triton Class patrol type submarine of 1090 tons displacement built by Vickers-Armstrong and launched in 1939 and sunk during the Second World War. She was armed with one 4-inch gun; two smaller guns and ten 21-inch torpedo tubes. She had a top speed of 15.25 knots surfaced and 9 knots submerged and carried a complement of...
Found on
http://www.probertencyclopaedia.com/browse/RT.HTM

tetrarch One of four joint rulers, directors, or heads.
Found on
http://www.wordinfo.info/words/index/info/view_unit/2126/3
No exact match found.