Their initial currency was iron rods (obols), as iron was a valuable metal, used in steel for weapons and agricultural tools.
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Iron was the basis of steel for ploughs and weapons. It was so scarce that Sparta used iron rods as currency (the obol).
No it was not important
Bares of iron, they looked like cores, or dowels
Sparta did not have any memorable buildings, although architecture was an important part of their culture. Their houses were extremely rough and basic and most buildings were purely for religious needs.
Service to the city-state through being a well-disciplined sodier
Athens was enemies with Sparta and Sparta was enemies with Athens