| Agis I | |
|---|---|
| King of Sparta | |
| Reign | c. 1057/6–1026/5 BC (mythical) or c. 930 – c. 900 BC (historical) |
| Predecessor | Eurysthenes |
| Successor | Echestratus |
| Issue | Echestratus |
| Father | Eurysthenes |
Agis I (Greek: Ἄγις) was a king of Sparta and eponym of the Agiad dynasty. He was possibly the first historical king of Sparta, reigning at the end of the tenth century BC, during the emergence of the Dorians in Laconia. He is said by most ancient authors to have conquered the region and enslaved the helots.