I'm not sure what empire you're referring to but it's probably the Macedonian empire and the person chiefly responsible for that was Alexander the great. Save
He helped establish an empire over 180 other Greek city-states which enriched Athens, and brought in radical democracy, and led it into a destructive 27-year war which cost it its empire and a massive loss of its people.
He created alliances with many greek city-states
Solon and Draco
There never was a "Greek empire".
Alexander´s empire was the largest the world had ever seen. An admirer of Greek culture, he worked to spread Greek influence throughgout his empire by founding cities in the lands he conquered.
Use of Greek orders.
Which teaching helped to spread Christianity in the Roman Empire? Slaves and the poor could hope for a better life after death. The Gospels written in Greek by his followers. Why did the Jews distrust King Herod?
In Greek myth, there is no "cracon".If you refer to "Kraken" that is a monster out of the Old Icelandic saga Örvar-Odd. Not Greek myth.
There never was a Greek empire.
There was never a Greek empire.There was never a Greek empire.There was never a Greek empire.There was never a Greek empire.There was never a Greek empire.There was never a Greek empire.There was never a Greek empire.There was never a Greek empire.There was never a Greek empire.
There was no Greek empire to destroy. The Greek world comprised over 2,000 independent city-states. They were eventually absorbed into the Roman Empire.
the capital of the greek eastern empire is Byzatine