IQ of Ancient Greeks would be closer to 80. Remember, all ancient peoples were far more primitive than the most modern nations today.
I don't buy it. Not that Greeks, like Athenians or Spartans were overworked in fields and any physical work. There was at least one slave per citizen in ancient times. They had plenty of time for education, and they had the best schools and universities in the known world. When we take under consideration accomplishments of ancient greeks in sciences, art, political systems and military achievements, in population of one million people, it is hard to conclude that their IQ was lower than in modern populations.
In modern world HQ of 80 only happens in most impoverished countries with almost none existent education systems. Athenians were rich and educated.
Upon reading Ancient history closely you get to understand that most people in Ancient Greece were underdeveloped.
To be fair lets skip farmers and slaves and talk about citizens of Athens and other big cities.
To cite but a single example. When Themistocles wasn't able to convince the Athenians that they should build ships to fight the Persians, he used a tall beautiful girl from a village near Athens and portrayed as the Goddess AThena. He started the gossip that the Goddess was watching over the Athenians and would be with them against the Persians. Using this trick, Themostocles managed to shift the public opinion.
It is not much different when politicians address modern Greeks and have to convince them that fiscal responsibility is important. And yet modern Greeks IQ is around 100.
Now, take notice, this were the Athenians during the Golden Era of their history. Yet, the majority of the population was easily fooled by superstition.
It is more about state of knowledge of the world than IQ per se.
Surely, the Greeks had individuals among them which had a high IQ. Perhaps we should say that their basic reptilian brain was well evolved. But to suspect Greeks as a whole had an IQ of 110 is mostly based on the idealized image we have of them.
You are not giving them enough credit. To invent things from scratch it takes a genius. If average IQ of society is low, you won't get that many geniuses in short period of time from population of around one million. That's why I think, some populations in the past, for some reason, had high IQ. If it goes for the whole country, one tribe, or just elite, I don't know.
The most developed modern populations with good education, economy and nutrition in 2014 have an IQ of 106. Arguing that the Ancient Greeks as a whole had 110 on average is hilarious.
They invented many things from scratch, enhanced and developed others inventions in many fields, and conquered the whole civilized world. All of this, you saying, with population of 1 million and IQ 80?
No offence, but modern Greeks with population of 10 million and IQ of 100 can't even come close to achievements of ancients. If anything, at least it should give you some perspective.