As you can see from his title, Apollo really ruled over a lot of things; he was quite an important deity to the Greeks. He’s known for his strong family ties as he is the son of Zeus and Artemis’s twin brother. The Greeks worshiped him for controlling both good and ill health and also for controlling the Muses (think music and poetry). Interestingly, Apollo was one of the few gods that the Romans also worshiped under the same name. However, the Romans focused mostly on him being the god of healing and prophecy.