Silver tetrobol, 14mm, 2.12gm, issued 492-479 BC
Obv: Horseman riding right holding two spears.
Rev: Quadripartite incuse square.
References: Sear 1483, SNG Cop 478, HGC 758.
Rare.
Initially Macedon was a dependency of the Persian Empire and Alexander was an ally of Xerxes during his invasion of Greece during the Persian Wars. Alexander was sympathetic to the Greek cause however, and after the Persian defeat at the battle of Plataea, Alexander attacked and routed the retreating Persian forces while they were marching through Macedon.