It was passed on from their culture
Lesbos
They gave it a culture which Rome could not develop itself - art, architecture, theatre.
Japan's culture definitely helped the country to develop economically. This is because what Japan valued could also be sold for a profit.
It's very hard to define a specific "slave" culture; since it was very regional and fragmented.
They liked letters
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France did not develop an institution that could limit the power of the king.
Crete
The nuns would develop them and help them grow.
The Phoenicians.
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In the related links box below, I posted the information.
Common language, culture, and traditions.
olmec