Why was alexander considered so impressive

He did something no man had ever done. Let’s start with his father, who reformed the Macedonian military and United most of Greece. Alexander then expanded Hellenic culture as far as India in the east , as far as Egypt south and of course in the west in Greece. After spreading his culture, and conquering such land that was unimaginable, he made all his soldiers rich off of the spoils of war. He did all of this before he could turn 32, when he died in Babylon

Prince henry the navigator is the man you're looking for.