Companion cavalry is the term used to describe the elite cavalry of the ancient Macedonian army, under the command of Alexander the Great. However, there are many other synonyms that can be used when referring to this crucial military unit. Some popular options include royal cavalry, cavalry guard, mounted knights, and horsemen. Other specific terms that may be used to refer to the companion cavalry include cataphracts, cuirassiers, and heavy cavalry. Regardless of the specific term used, it is clear that the companion cavalry played a critical role in the success of the Macedonian army, and its reputation as a formidable fighting force lives on to this day.