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In his youth, Barnabas was a soldier before turning to commercial shipping for a livelihood. In this capacity, he developed a network of contacts throughout Greece, including local leaders and mercenaries, who became a primary source of information for Kassandra. By offering his ship and crew to the Spartan mercenary, so that they might first leave Kephallonia, the two befriended.
At some point, Barnabas met Leda, a native of the Greek island of Ithaka, and they fell in love, eventually marrying. They also sailed together regularly.
One night during a siege, Barnabas' fleet was destroyed during a storm. During the same incident, Barnabas claimed to have come face to face with Poseidon's "murderous pet", and lost his eye to it. As their ship was wrecked, Leda roped together the remains and together she and Barnabas paddled to a shore.
However, the two were separated. Later, Barnabas left the navy, and became a sailor in his own right, eventually rising to be the captain of his own ship, the Adrestia.
In 431 BCE, Barnabas visited the island of Kephallonia and docked at the town of Sami. While exploring the island, he met the Cyclops of Kephallonia and told him of a tale he had heard during his last voyage. When Barnabas mentioned the words "one-eyed monster", he was kidnapped by the Cyclops to Kleptous Bay, unaware that the words were considered sensitive to the Cyclops.
The Cyclops repeatedly dunked Barnabas' head into a vat of water, only stopping after he was confronted by the misthios Kassandra. Kassandra eliminated the Cyclops and his men, bringing Barnabas to safety outside the bay. After introducing himself and telling his stories, Barnabas agreed to lend his services and ship to Kassandra, who was in need of a ship to travel to Megaris. Barnabas informed Kassandra to meet him back in Sami whenever she's ready to depart.
As they departed from Sami, Kassandra told Barnabas to set sail to Megaris, as he had a contract from Elpenor to eliminate the Wolf of Sparta. As Barnabas mentioned the Wolf to be Nikolaos, Kassandra revealed that Nikolaos was her father.
Around 428 BCE Pausanias of Sparta, one of the two kings of Sparta, tasked Kassandra with escorting the Spartan Pankration champion Testikles to the Olympic Games. Unfortunately, the man died on the way there, and at Alkibiades's urging, Kassandra became the representative of Sparta at the Olympics.
Once they had reached the Sanctuary of Olympia, Barnabas was more than happy to give Kassandra a tour of the city, while telling her about the history of the Games and traditions associated with it.
During the Olympics Alkibiades participated with a number of others in a habitual celebration hosted by his old friends and Olympic judges Kallias and Demophanes. Soon afterwards, he fell ill, and while Barnabas looked after him, Kassandra investigated, finding the other participants dead...save for Kallias. She followed clues to the merchant Priam, who led her to the antidote, which saved Alkibiades' life.
In around 424 BCE, Barnabas and Herodotos accompanied Kassandra when she went to Theras to meet her birth father, although he remained on the Adrestia. When she returned and told them her father was none other than the famed philosopher Pythagoras, Herodotos was shocked. After Kassandra had gather the four Atlantis artifacts and sealed the ancient city, she made Barnabas and Herodotos promise never to tell anyone about the place, to which they agreed.
Personality and characteristics
Barnabas strongly believed in the Greek gods and the old legends of heroes and mythical beasts, as well as that everybody's fate was predetermined by the gods. He also believed that the Pythia could never be controlled by anyone but the gods and was shocked upon the revelation that anyone could. He also respected Kassandra's role, believing the gods set her upon this. He also has a habit of pointing out the mythical information of certain areas like Marathon.  Barnabas was also a kind and cheerful man since he almost never makes any complaint in a completely calm state.
Barnabas is known to have courted at least three women during his lifetime. Sometime in the early 400s BCE, Barnarbas was married to a woman named Leda of Ithaka. However, they were separated, and he lost track of her. He also unknowingly fathered a child with Leda, also named Leda, whom he reconnected with almost thirty years later.
In around 428 BCE, Barnabas took a liking to a widowed Naxian woman, Photina, during the months Kassandra and her mother reconnected with each other. Barnabas even allowed Photina to tattoo his back and braid his hair. As a parting gift and as a token of their short love Photina gave Barnabas an medallion, previously owned by her husband. Barnabas called the medallion "a piece of Pythagoras' wisdom." While the two enjoyed each other's company, Barnabas' seafaring lifestyle led them apart.
Some time later during the later 420s BCE, Barnabas met Iola at the Sanctuary of Apollo on the island of Delos, and according to them, it was "love at first sight." Later, they celebrated the Silver Islands' liberation together. Iola also took to calling Barnabas by a pet name "Barney." Kassandra then offered Iola to join their crew, and Iola accepted. When Barnabas met his daughter he told her of Iola and wanting to introduce her.
- ↑ Assassin's Creed: Odyssey
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Assassin's Creed: Odyssey – The Big Break
- ↑ 3.0 3.1 Assassin's Creed: Odyssey – Odyssey Into the Past
- ↑ 4.0 4.1 4.2 Assassin's Creed: Odyssey – Daddy's Home
- ↑ Assassin's Creed: Odyssey – Delivering a Champion
- ↑ Assassin's Creed: Odyssey – Barnabas Abroad
- ↑ Assassin's Creed: Odyssey – The Long Game
- ↑ 8.0 8.1 Assassin's Creed: Odyssey – A Night to Remember
- ↑ Assassin's Creed: Odyssey – A Family's Legacy
- ↑ Assassin's Creed: Odyssey – Atlantis Destroyed
- ↑ Assassin's Creed: Odyssey – Consulting a Ghost
- ↑ Assassin's Creed: Odyssey novel – Chapter 11
- ↑ Assassin's Creed: Odyssey novel – Chapter 12