Where did Plato get his data? ?

When he said that democracies turn into tyrannies? Did democracies exist before Greek times? 

?2019-12-18T12:05:56Z

Favorite Answer

History was his guide.  He was Athenian and saw it happen first hand.  Athens slipped into tyranny multiple times:

Cylon, 632 BC (stoned)   
Pisistratus, 561 BC, 559-556 BC and 546-528 BC   
Hipparchus, 527-514 BC (murdered)   
Hippias, 527-510 BC   
Theramenes, Critias, and Charicles leading members of the Thirty Tyrants 404-403
Lachares, 300-294 BC   
Aristion, 88-86 BC (executed)

Anonymous2019-12-18T12:14:36Z

Logic, the source of all data. 

Anonymous2019-12-18T12:10:50Z

Knowledge, not data.

Anonymous2019-12-18T12:04:50Z

It’s obvious. The system of governance never remains the same forever 

Anonymous2019-12-18T12:03:46Z

Yes, they did. The Greeks invented nothing except man-boy love