Agiad is a term that refers to a specific lineage of ancient Greek kings, particularly associated with the city-state of Sparta. This royal family played a significant role in Spartan history, contributing to its military and political power. The Agiad dynasty is one of the two main royal families in Sparta, the other being the Eurypontid dynasty. The Agiad kings were known for their leadership during critical periods, including the Peloponnesian War. They were often involved in military campaigns and were seen as symbols of Spartan strength and discipline. The lineage is traced back to Agius, a legendary figure in Spartan lore.