Royal stars are stars in the night sky that were thought to be special or powerful in some way by ancient cultures like the Babylonians, Egyptians, and Greeks. For example, the Babylonians thought that royal stars would influence the rulers of their empires. The ancient Greeks thought that the royal stars could bring good fortune to those who could see them in the night sky and believed that the stars were even linked to the gods and goddesses in their pantheon. Today, astronomers still use the same names for some of the stars as the ancient people did. For example, one of the royal stars is known as Regulus, which means 'little king' in Latin. So, royal stars are stars in the night sky that have special symbolic meanings to people in ancient cultures.