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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.
Barnabas was born in an olive grove on the island of Mykonos. He and his brothers later joined the Athenian army, serving as captains in the Athenian navy. One night during a siege, the 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. He would eventually find himself a solo captain and soon reach Kephallonia.
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.
Personality and characteristics
Barnabas strongly believed in 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 is also a kind and cheerful since he almost never makes any complaint in a completely calm state.
- ↑ Assassin's Creed: Odyssey
- ↑ Assassin's Creed: Odyssey – The Big Break
- ↑ Assassin's Creed: Odyssey – Delivering a Champion
- ↑ Assassin's Creed: Odyssey – Barnabas Abroad
- ↑ Assassin's Creed: Odyssey – The Long Game
- ↑ Assassin's Creed: Odyssey – A Night to Remember
- ↑ Assassin's Creed: Odyssey – Consulting a Ghost
- ↑ Twitter: #ACFact: Your sailing companion Barnabas is a strong believer that everyone’s fate has been decided by the gods.