The Spartan Kings were the dual rulers of ancient Sparta, a powerful city-state in Greece. Each king belonged to one of two royal families, the Agiad and the Eurypontid, and they shared power to ensure stability. Their primary roles included leading the military and performing religious duties, which were crucial for maintaining the city-state's strength and traditions. These kings were not absolute rulers; they had to work with the Gerousia, a council of elders, and the Apella, an assembly of citizens. This system of dual kingship helped balance power and prevent tyranny, allowing Sparta to thrive as a formidable military force.