Leonidas is a masculine given name of Ancient Greek origin. It derives from the Greek words λέων (leon) meaning "lion" and the patronymic suffix ἴδης (ides), collectively meaning "lion's son" or "descendant of a lion". Historical Significance The most famous bearer is Leonidas I, king of Sparta from around 489 BC to his death in 480 BC, as recorded by Herodotus and other ancient historians. According to Greek tradition, Leonidas was a member of the Agiad dynasty, a royal house that claimed descent from the mythical hero Heracles. At the Battle of Thermopylae in 480 BC, during the Second Greco-Persian War, Leonidas famously led a small force of allied Greeks—most notably his 300 elite Spartan soldiers—in a desperate defense of the narrow pass against the vast invading army of the Persian king Xerxes I. Leonidas fell during the third and final day of the battle, along with his entire contingent, an act that cemented his status as a symbol of heroic sacrifice and martial valor. Although the Persians ultimately won that engagement, the stand at Thermopylae inspired the Greek city-states to unite and later achieve victory at Salamis and Plataea. Beyond antiquity, Leonidas was also the name of a 3rd-century Christian saint and martyr from Alexandria, notably the father of the influential theologian Origen. He was executed under the persecution of the Roman emperor Severus Alexander, likely around 202 AD, and is venerated as a saint in the Catholic and Orthodox traditions. Related Names Leon, derived from the same root, shares the "lion" meaning and is common across Europe. Variant forms in other languages include Leanid (Belarusian), Léonide (French), Leonida (Italian), Leonīds (Latvian), and Leonid (Ukrainian). Meaning: "Lion's son" Origin: Greek Usage: English, Greek, various European languages Type: First name