Though she was not exactly a 'beast', Perseus was known for slaying a monster, the gorgon Medusa.
Polydectes.
To slay Medusa.
he was known for slaying Medusa A horrible gorgon ,a mythical beast which hideous features which turn victims to stone, he was sent by polydectes to slay her as a wedding gift to get rid of perseus in order to marry his mother. Soon after perseus turned a horrible sea beast to stone to save a princess which later became his wife of 6 kids (5 boys and 1 girl).He returned with the head and turned polydectes to stone as the king did not believe him so perseus showed him the head therefor ending the myth
Thesius.
It is the quest of King Pellinore's family to slay the Questing Beast.
Perseus was sent to slay Medusa and bring back her head.
Perseus faces external conflict with the gods, particularly with the character of King Polydectes. Polydectes sends Perseus on a perilous quest to slay Medusa in order to get rid of him within the story of Greek mythology.
The god Hermes aided Perseus by providing him with a sword to slay Medusa and a reflective shield to avoid looking directly at her. Additionally, Athena helped Perseus by giving him a polished shield to help him safely approach Medusa.
Perseus receives gifts from the gods in the book "Perseus". Hermes gives him a sword, Athena provides a polished shield, Hades lends him his helmet of invisibility, and Zeus gifts him with winged sandals. These gifts help Perseus on his quest to slay Medusa and save Andromeda.
Perseus's sword, which he used to slay the Gorgon Medusa, was crafted from celestial bronze. This material was known for its strength and sharpness, making it ideal for combat against formidable foes. The sword was given to him by the god Hermes, enhancing Perseus's ability to carry out his heroic tasks.
He uses the mirrored back of the Aegis to strike at Medusa without looking her in the eyes. He beheaded her, and then put the head in a sack.
Perseus received the shoes of swiftness from Hermes, the messenger god. These magical sandals allowed him to fly and travel swiftly, aiding him in his quest to slay the Gorgon Medusa. Hermes, along with Athena, provided essential tools and guidance to help Perseus succeed in his mission.