Fired with love for Admetos, #Apollon made all the cows bear twins. But then #Hermes was born and built the first lyre and Apollon traded his cattle whip for the instrument, making Hermes keeper of herds.
Hermes is also the god of trade and merchants, watching over the marketplace in the agora, a natural extension of his role since animals and their by-products were brought to the market to sell. Thievery and scams, of course, are also tools of the trade...
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