Tereysa de Lyaño was a tavern girl in the Spanish port of Denia during the Renaissance. Born to a farming family, Tereysa made her way to Denia seeking a more vibrant and exciting life. She found great satisfaction in talking to the pirates who came into the tavern, finding their tales invigorating and inspiring.
When she met Rodrigo de Mendoza and Alonso Pinto, she shared her hope that she could one day sail with a pirate crew, and they invited her to join them. A fast learner and very nimble, Tereysa settled into the life of a pirate very quickly. Her bravery, agility, and quick grasp of sword-fighting skills earned her the respect of her crewmates.
When Rodrigo joined the Brotherhood after having his holdings confiscated by the Spanish Inquisition, Tereysa followed him unhesitatingly.
- Tereysa is the Spanish variant of "Teresa", derived from the Greek therizein (to reap, to gather in).
- Tereysa shares her character design and profession with the Byzantine Templar Eveline Guerra and the Corsair Animi Avatar in Abstergo Industries' secondary stage of the Animi Training Program.