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Nasuverse character
Japanese name: イアソン
Also known as: Hero Scout
Franchise: Fate
Appears in: Fate/Grand Order
Character type: Heroic Spirit, Servant
Gender: Male

Jason (イアソン, Iason?) is a Heroic Spirit and the husband of Medea. He appears in Fate/Grand Order.



Jason (イアソン, Iason?) was the captain of the Argo. He was one of many heroes taught by Chiron.[1]

Jason argued with King Pelias, the usurper of his father's country Iolcos, and eventually made him promise to return the country upon traveling far east to Colchis and returning with the Golden Fleece. The golden fleece was owned by King Aeëtes of Colchis.

When Jason arrived in Colchis. Jason was supported by the Goddess Aphrodite, and upon realizing that the King of Colchis was unshakable, she decided to control Medea's mind to help Jason. Medea was made to blindly love Jason, which resulted in her betraying her father and her country for a foreigner she had never seen. Her abilities allowed her to nullify her father's magic and the enchanted fire-breathing oxen, which gave Jason the chance to obtain the Golden Fleece.

King Aeetes was infuriated, and decided to personally lead his army to capture Jason before he left the country. Aphrodite once again used Medea to assist Jason's escape by forcing her to kill her own brother, Apsyrtus. While she only knew Jason by name, her forced love caused her to board his ship, the Argo, and slice her brother into pieces right before the eyes of her pursing father. The King, overcome by grief, ordered for the collection of the pieces of his dead son, which allowed for the opportunity for the Argo to escape its pursuers.

After that, Medea, in order to let her beloved Jason sit on the throne, continued to murder any opposition with magic and strategy, but her practices disgusted Jason and caused him to gradually become adverse to her. Eventually, Jason switched his interests to another woman, going so far as to have children, which Medea could not forgive. She murdered his new wife and children with magecraft, the brokenhearted Jason undergoing a miserable last moment.[2]


In Fate/Grand Order. Jason has a younger appearance of a young man with blond hair.



Fate/Grand OrderEdit

Jason is an antagonist in the third singularity, Okeanos. He seeks out the Ark of the Covenant to grant himself ultimate power. Jason was transformed into the Demon God Forneus by Medea Lily.

Other appearancesEdit

In the Studio Deen adaptation, of Fate/stay night, Jason was seen in Caster's flashback where he was marrying Creusa which later breaks Medea's heart as she was seen crying. Jason makes a brief appearance in the first season anime adaptation of Fate/stay night [Unlimited Blade Works]. It is the scene where Shirou Emiya was heading towards Ryuudou Temple, where he is being controlled by Caster, Jason was seen holding the Golden Fleece.

In Fate/Apocrypha, it is mentioned that a remnant of the Argo is a catalyst that would be able to summon Jason and various other Greek heroes who sailed on the ship.

Jason is mentioned to be one of the ten Servants who can be summoned by the Player in the prototype of Fate/strange fake.


  • Argo

Jason is said to be weak to the point where it is possible to not even count him as an enemy, described by Atalanta as a "useless person". While he can be described as the "monster who organized the Argonauts" with only his eloquence and charisma, his power in battle does not amount to anything.

He captains the Argo (アルゴー号, Arugō-gō?) while his allied Servants do the fighting for him. Argo is a ship carrying Heroic Spirits from the Age of Gods.[3]


In the Studio Deen adaptation of Fate/stay night, Jason had the appearance of a middle aged bearded man.


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