"A tropaion (Greek: τρόπαιον, Latin: tropaeum), whence English "trophy" is derived, is an ancient Greek and later Roman monument set up to commemorate a victory over ...
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one´s foes. Typically this takes the shape of a tree, sometimes with a pair of arm-like branches (or, in later times, a pair of stakes set crosswise) upon which is hung the armour of a defeated and dead foe. The tropaion is then dedicated to a god in thanksgiving for the victory." - (en.wikipedia.org 16.10.2019)