Most of them were disputes over territory or resources between the Greek city-states. The external wars were against attempted intrusions from Persia, Macedonia and Rome, and finally from Asian peoples migrating in.
The Olympic Games caused a pause in wars.
the wars in ancient Greece were caused by troy and aineias to which the troyans were displaced and were trying to get there borders
The two most impartant ancient historians who wrote about the Second Punic War were Polybius (a Greek) and Livy (a Roman).
I think the Hittites started the most wars in Ancient Egypt.
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No. Medusa is originally from Ancient Greek mythology.
I am not sure that Ancient Greek Gods actually started any wars, but it has to be pointed out that states would not go into war without the consultation of an oracle to see if they have the support of the Gods (to win the wars, as the Gods were responsible for everthying)
No the Greek gods were not "grumpy". In fact, most of them were quite cheerful. However, they tended to take sides in mortal wars. It is believed that in WW2 the Greek gods took sides. They don't fight in the mortals' wars, but they start their own wars with each other because they disagree about who should/will be victorious in the mortal wars. In general though, the gods were not grumpy. They merely had minor discrepancies that caused anger and irritation occasionally leading to wars.
They rammed into each other and killed each other :)
Economics, in particular disputes over natural resources, are the cause of most wars.
I will list you some Greek wars: Sparta vs. Athens Persia vs. Greece: Marathon Thermopylae Salamis thanks! i wish i helped!
See the list in the site Greek Wars in the separate panel Sources and related links below.