Leonidas II, was the 28th Agiad King of Sparta from 254 to 235 BC. He was raised at the Persian Court, and according to Plutarch's Life of Agis IV, he married a Persian woman. According to other sources, this non-Spartan wife was actually a Seleucid, possibly the daughter of Seleucus I Nicator by his Persian wife Apama. She was therefore not fully Persian, but half-Macedonian and half-Persian. His Persian-influenced lifestyle, his non-Spartan wife and his half-Spartan children would all be made issues by the ephor Lysander, the co-king Agis IV and their supporters.
Leonidas II opposed the attempted reforms of his Eurypontid co-king, Agis IV. The ephor, Lysander, claimed to have seen a sign from the gods against Leonidas, and Leonidas fled to avoid his trial. In his absence, Leonidas was deposed from the throne and replaced by his son-in-law, Cleombrotus II.
He later returned to Sparta while Agis was on campaign in Aetolia and deposed and exiled Cleombrotus II, and reclaimed his throne. Soon after, he deposed and executed Agis IV alongside his mother Agesistrate and grandmother Archidamia.