Aunt or uncle would be the most common term. The actual term would be great aunt or great uncle.
Your great-grandfather's father is typically referred to as your great-great-grandfather. This term denotes the father of your great-grandparent, situating him two generations back from you.
Hellenistic culture
Hellenistic = like Greek.
a mad man
One term is "stoic" Another could be that they have great endurance / tolerance etc
Hellenistic means Greek. D. the impact of the greek empire founded by Alexander the great
Cultural Diffusion is often associated with Hellenism.
If you mean a word for the grandmother of one of your parents, the standard term is great-grandmother. If you want to write the name that you call her, and if you say it as "great-gramma," that spelling is as good as any.
He would be your grand nephew; you would be his great-aunt.
The term "great niece" or "grand niece" is a parallel construction from the more common terms "granddaughter" and "great granddaughter."
The most noted short term effect of Alexander the Greats reign was the unity of his empire. Before his death the empire spread from Greece to Egypt, but quickly broke apart after he died.