He left behind his generals who divided his empire amongst them and established an era of relative stability in the Middle East and Greece. This lasted a couple of centuries until the Roman Empire began to take over.
Democracy
One of Alexander the Great's friends was Callisthenes, a relative of Aristotle. Some of his other long-time friends were Hephaestion, Cassander, and Ptolemy, who all served as generals in Alexander the Great's army.
It stretched from Libya-Egypt through the Middle East to Central Asia and today's Pakistan in the east.
I presume you mean Tsar Alexander II of the Russian Empire. He did many things, of course, but his main achievement was the emancipation, at LONG last, of the millions of Russian serfs.
Long-lasting
Alexander died from malaria, when he died he said that his empire would go to the strongest military leader.
It took the Greats ten days to build Beowulf's tower.
After he died the people of Greece and Persia and all the lands between mixed together and shared ideas and culture
The term is hyphenated as "long-lasting" (persistent, perennial, long-lived).
I think Remy hair is the longest lasting hair!
Plastic is a non-biodegradable substance. Yes, it is long lasting.
Same makers of viagra.