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Leonidas I (c. 540 BCE – 480 BCE) was a warrior king of the Greek city-state of Sparta, best known for his involvement in the Battle of Thermopylae against the Achaemenid Empire in 480 BCE. Leonidas wielded an Isu spear, which was later passed down to his daughter, and then his granddaughter, the misthios Kassandra. Through his granddaughter, Leonidas is also an ancestor of Aya of Alexandria, who, along with her husband, the Medjay Bayek of Siwa, would go on to found the Hidden Ones, the forerunners of the Assassin Brotherhood.
A direct descendant of the Isu, Leonidas possessed a proportionally-higher level of Isu genes than usual; consequently, so did his descendants.
- "The Persians come to make slaves of us all. I have a better plan. I say we drench the gods with their blood."
- ―Leonidas the Spartans before the Battle of Thermopylae, 480 BCE[src]
In 480 BCE, Leonidas consulted the Pythia at the Sanctuary of Delphi about going to war against the Achaemenid Empire of Xerxes I of Persia, who had invaded Greece. The Cult of Kosmos, who supported Xerxes I and manipulated the Pythia and were present during his consultation, threatened Leonidas not to go against their plans. Nevertheless, Leonidas defied the order and commanded his officer, Dienekes, to gather the army for battle.
Leonidas and his army gathered at a narrow passage way in Malis, where the Persians would have to pass through in order to reach mainland Greece. Prior the battle, Leonidas reminisced to Dienekes about how he would have liked to have gone fishing with his son. Upon spotting the arrival of the Persian fleet in Malis, Leonidas briefed his men and braced for the attack. During the first wave, Leonidas clashed and defeated a Persian officer, Kurush. 
In the aftermath, one of the Spartans revealed that they had been betrayed by one of the Greeks, who revealed a path behind the passage which allowed the Persians to maneuver around. Nevertheless, Leonidas refused to retreat and ordered his men to defend the pass. The Spartans were able to defend the passage for seven days, though they were eventually overwhelmed. Soon after the death of Dienekes, Leonidas himself perished, but not before killing a Persian officer who delivered a mortal injury to him.
Following Leonidas' death, Xerxes, who was otherwise recognized for his civility and honor when dealing with his fallen foes, had been so deeply infuriated by Leonidas' defiance that he had his head cut off and impaled on a pike. His remains, along with his spear, were later recovered and returned to Sparta, where he was buried in a tomb southwest of the city, while his broken spear was handed down to his daughter, Myrrine, who in turn passed it on to her daughter Kassandra.
When the Isu Aletheia created a simulation of Elysium for the Leonidas' descendant Kassandra to better learn how to wield the Staff of Hermes Trismegistus which Pythagoras had passed on to her, she met a simulant Leonidas within.
Personality and characteristics
Leonidas was shown to deeply care for Sparta and those who inhabit it, as he was willing to defy the Cult and defend his home to the death. Following the Battle of Thermopylae, Leonidas was noted for his great courage, as he bravely fought to the death against the Persians despite their overwhelming numbers.
Leonidas was also mentioned as having a hard to control temper. A good example of his temper would be from the Battle of Thermopylae: when presented with the traitor Ephialtes, gloating about Persia winning, Leonidas immediately thrust the tip of his spear through his mouth to silence him.
- ↑ Totilo, Stephen. "Everything We Learned About Assassin's Creed Odyssey After Playing It". Kotaku. 12 June 2018. Accessed 13 June 2018.
- ↑ Assassin's Creed: Odyssey – Bully the Bullies
- ↑ 3.0 3.1 Assassin's Creed: Odyssey – Battle of 300
- ↑ 4.0 4.1 4.2 Assassin's Creed: Odyssey – Memories Awoken
- ↑ 5.0 5.1 5.2 Assassin's Creed: Odyssey
- ↑ Assassin's Creed: Odyssey – The Fate of Atlantis: Fields of Elysium