The Greek King Alexander had a special bodyguard whom he commanded personally, they also accompanied him on all his conquest and were often assigned the toughest part of his attack strategy, what were they called?

The Companion Cavalry (Hetairoi) was Alexander the Great's elite cavalry unit that served as his personal bodyguard and shock troops. They were composed of Macedonian nobility and were crucial in battles like Gaugamela. The Thracian Archers were auxiliary troops, Knights of Santiago are medieval (much later period), and Corinthian Hoplites were Greek infantry not specifically associated with Alexander.