Tetrobol - Hecatomnus Mylasa

Hecatomnus was the first of the Hekatomnid dynasty — technically an Achaemenid-appointed satrap of Caria, but in practice an autonomous ruler who laid the groundwork for his son Mausolus to build the Mausoleum at Halicarnassus. He governed from Mylasa, not the later dynastic capital, and his coinage reflects a period when Carian rulers were quietly asserting independence through currency while remaining nominally loyal to Persia. The tetrobol denomination placed these firmly in Greek commercial circulation rather than Persian administrative use.