Leonidas was a brave king. 
Leonidas was a king in Sparta. 

Leonidas I was a king in Sparta. Sparta was a city in ancient Greece. His name means "son of a lion." He was part of a royal family. 
In 480 BC, a large army came from Persia. They wanted to take over Greece. The Greek leaders chose Leonidas to lead them. He led a small group of soldiers to a place called Thermopylae. This place was a narrow pass. 
Leonidas had 300 Spartan soldiers with him. Other Greeks joined them too. The Greek force grew to about 7,000 men. They fought the Persian army for several days. A man named Ephialtes showed the Persians a mountain path. This allowed the Persians to get behind the Greeks.
Leonidas sent most men away to keep them safe. He stayed to fight with his Spartans. He also stayed with some Thespians and Thebans. Leonidas died in the battle. Even though the Greeks lost this fight, they won the war a year later. People still remember him as a hero. 
Leonidas I was a famous king from ancient Sparta. Sparta was a powerful city-state in Greece. He belonged to the Agiad dynasty, a royal family. This family claimed they were related to the hero Heracles. His name might mean "son of a lion" in Greek. This was because the name Leon means lion. 
Leonidas became king after his half-brother, Cleomenes I. He shared the throne with another king named Leotychidas II. He was a full citizen of Sparta. This meant he had completed the tough Spartan training. The Greek leaders chose him to lead their forces. They wanted a strong military leader to help them. They needed someone to stop the Persian invasion.
In 480 BC, a huge Persian army arrived. The Persian king was named Xerxes I. Leonidas led a small group to Thermopylae. This was a narrow pass between mountains and the sea. He started with 300 Spartan soldiers. Other Greek groups joined him to help. The total Greek force reached about 7,000 men. 
The battle lasted for many days. The Greeks fought well and held the pass. On the seventh day, a man named Ephialtes helped the Persians. He showed them a mountain path to get behind the Greeks. Leonidas sent most of the army away to keep them safe. He stayed with his 300 Spartans and some others. They fought until Leonidas was killed in the battle. 
Even though Leonidas died, the Greeks won the war later. People have remembered him as a hero for a long time. In Sparta, they held special festivals to honor him. Today, many stories and movies are about his brave stand. There is even a bronze statue of him at Thermopylae. A sign there says "Come and take them" in Greek. This was his famous reply to the Persian king.
Leonidas I was a king of the ancient Greek city-state of Sparta. He belonged to the Agiad dynasty, a royal house. This family claimed they were descendants of the hero Heracles. His name likely means "son of a lion" because "Leon" is the Greek word for lion. Leonidas became king after his half-brother, Cleomenes I, was deposed. He ruled jointly with another king named Leotychidas II. He was a full citizen, or homoios, of the Spartan state. This meant he had successfully completed the rigorous Spartan training known as the agoge. 
In 481 BC, the Greek city-states formed a coalition to resist a Persian invasion. They chose Leonidas to lead their combined forces. This choice was not just because of his royal blood. The Greeks likely chose him because of his personal capability as a military leader. Two years after his death, the coalition preferred Athenian leadership over other Spartan leaders. This suggests they specifically valued Leonidas's unique skills. He was a proven leader who had been a full citizen during previous conflicts. 
In 480 BC, the Persian king Xerxes I invaded Greece with a massive army. Historians have different estimates for the size of this force. The ancient writer Herodotus claimed there were over two million men. Modern scholars believe this is an exaggeration. Most modern estimates range from 70,000 to 300,000 soldiers. Leonidas led a small force to defend the pass at Thermopylae. He arrived with 300 Spartan hoplites and 900 helots. Other Greek city-states sent troops to join him. The total Greek force reached between 4,000 and 7,000 men. 
The battle at the pass of Thermopylae lasted for several days. Xerxes waited four days before attacking his enemies. On the fifth and sixth days, the Greeks repulsed frontal attacks. They killed roughly 10,000 Persian troops during this fighting. The Persian elite unit, known as the Immortals, was held back by the Greeks. Even two of Xerxes' brothers, Abrocomes and Hyperanthes, died in the combat. The Greeks held the narrow pass effectively against the much larger Persian army.
On the seventh day, the situation changed due to a traitor. A Malian Greek named Ephialtes showed the Persians a mountain track. This path allowed the Persian general Hydarnes to reach the rear of the Greek position. Realizing the danger, Leonidas sent most of the Greek troops away. He wanted to preserve those soldiers for future battles. He remained in the pass with his 300 Spartans. He was also joined by 900 helots, 400 Thebans, and 700 Thespians. The Thespians chose to stay by their own will to fight alongside him. 
The final stand was violent and resulted in the death of Leonidas. The small Greek force was attacked from both sides. All the defenders were killed, except for the 400 Thebans who surrendered. After Leonidas fell, the Spartans fought to retrieve his body. They successfully drove back the Persians four times to reach him. Xerxes had ordered Leonidas's head to be cut off and his body crucified. However, these orders were considered sacrilegious. While the Greeks lost this specific battle, they eventually expelled the Persian invaders the following year.
Leonidas left a massive legacy that lasted for centuries. In Sparta, a hero cult was maintained until the 2nd century AD. Spartans celebrated annual solemnities called Leonideia in his honor. These festivals were held at monuments in Sparta. Today, his story is a major part of modern culture. A bronze statue of Leonidas stands at Thermopylae. It features the famous Greek phrase "MOLON LABE." This means "Come and take them." This was his laconic reply to Xerxes when asked to surrender his arms. 
His life has inspired many different forms of art and media. The epic poem "Leonidas" was written by Richard Glover in 1737. In modern times, he is a central figure in various stories. He appears in the novel "Gates of Fire" by Steven Pressfield. He is also the protagonist in Frank Miller's "300" comic book series. This story was later adapted into a major motion picture. Leonidas also appears in video games like "Assassin's Creed Odyssey." These works often focus on his role as a symbol of sacrifice and duty.
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