Yesterday, 2K announced that Persia, led by Cyrus the Great, would be one of two new civilizations added to Civilization 6 in upcoming DLC. Today, it unveiled Cyrus' partner in that expansion, and he's pretty great too. His name is Alexander, son of Philip, and he's the ruler of Macedon.
Macedon's unique Hypaspist units are elite, shield-bearing soldiers who carry a spear and short sword into battle, while the Hetairoi—better known as the Companions—are a fast, heavy cavalry unit that's "widely regarded as the world's first shock troops." For a unique building, Macedon gets the Basilikoi Paides, where noble sons and young boys taken as political hostages are raised to "serve, honor and protect the king, and to serve Macedon’s interests above all else," and the unique "Hellenistic Fusion" ability grants it a bonus every time a city is conquered.
As for Big Al himself, he's all about the fight. His ability, To the World's End, grants reduced war weariness, so that Macedon can stay at war with its neighbors for longer stretches without suffering unduly for it.
Ironically, in the same sense of the term as Tomyris' appearance in the Persia teaser, Alexander was ultimately unable to reach the world's end: His army refused to follow him into India, and he was forced to turn back at the Beas River. He died three years later, in Babylon, at the age of 32.
Macedon and Persia will be available together in an upcoming Civilization and Scenario Pack, scheduled to come out later this spring.