dafool

Unlike most RTS games which are historically based, COT will not advance by "ages" but rather the technoglogical innovations that marked human progress.  You research a tech, and gain access to the benefits of that technology.  Later technologies require that earlier one be researched first.

Bronze Working: Spearmen, Impi, Hoplite, Numidian Mercenary

Masonry: Walls

Alphabet: none

Pottery: Granary

The Wheel: Chariot

Warrior Code: Archer, Bowman, Javelin Thrower

Ceremonial Burial: Temple

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Iron Working: Requires Bronze Working.  Swordsman, Immortal, Legionnaire, Gallic Swordsman

Mathematics: Requires Alphabet and Masonry.  Catapult 

Writing: Requires Alphabet

Horseback Riding: Requires the Wheel and Warrior Code.  Horseman, Mounted Warrior.

Mysticism: Requires Ceremonial Burial.

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The rest later