Nabis () was ruler of Sparta from 207 BC to 192 BC, during the years of the First and Second Macedonian Wars and the eponymous "War against Nabis", i.e. against him. After taking the throne by executing two claimants, he began rebuilding Sparta's power. During the Second Macedonian War, Nabis sided with King Philip V of Macedon and in return he received the city of Argos. However, when the war began to turn against the Macedonians, he defected to Rome. After the war, the Romans, urged by the Achaean League, attacked Nabis and defeated him. He then was assassinated in 192 BC by the Aetolian League and was Sparta's last independent ruler. He represented the last phase of Sparta's reformist period.