Eudamidas I (Greek: Εὐδαμίδας) was Spartan king between 331 and c. 300 BC. He succeeded his brother Agis III, who died at the battle of Megalopolis against Macedonia. Eudamidas' reign was therefore peaceful as Sparta recovered from this disaster. He even refused to join the other Greek states in the Lamian War in 323, and was later noted for his interest in philosophy—peculiar for a Spartan king. Life and reign Eudamidas was the son of king Archidamus III () and grandson of Agesilaus II () who belonged to the Eurypontid dynasty, one of the two royal families of Sparta (the other being the Agiads). His mother was Deinicha, probably the daughter of Eudamidas, himself brother of Phoebidas, a Spartan commander who captured the acropolis of Thebes in 382. As Phoebidas was a friend of Agesilaus II, the king had arranged the marriage of his son Archidamus with his friend's niece, which explains how the name Eudamidas entered the catalogue of names of the Eurypontids. Archidamus had two other sons beside Eudamidas; the eldest was king Agis III () and the third one was Agesilaus. Considering the prestige of the latter's name, it has been suggested that he was the second son and Eudamidas the youngest. It would therefore means that Agesilaus died in 331 together with Agis III at the Battle of Megalopolis, which prompted Eudamidas' accession to the throne. Eudamidas' reign was peaceful and uneventful. In 323, he notably refused to join other Greek states in their revolt against Macedonia, which dominated Greece since the Battle of Chaeronea in 338, but was shaken by the death of Alexander the Great. Sparta at the time was still recovering from its disastrous defeat at Megalopolis in 331, after which Macedonia additionally kept 50 Spartan hostages. Moreover, the Greek coalition was led by Athens, which had refused to join Agis III in 331, and counted Sparta's bitter enemies Argos and Messene. During his reign, perhaps at the occasion of the raid of Cassander (the Macedonian regent) to Messenia in 317, Sparta built its first city-wall, while it had hitherto relied on its military might to fend-off enemies. Although the wall was merely a palisade, it shows that Sparta's power had seriously waned at the end of the fourth century. Eudamidas might nevertheless have passively resisted against Macedonia, as in 314 he let Antigonos Monophtalmos recruit mercenaries at Tenarion (within Spartan territory) in