Rosa Gallego was a highly respected Spanish thief during the Renaissance, and sister to Luisa Gallego. She was the oldest and most extravagant daughter of Lupo Gallego, the Spanish King of Thieves and founder of the infamous Thieves' Guild in Madrid.
From a young age, Rosa underwent rigorous training in thievery and stealth while prowling the streets of Madrid. Her knack of blending into her surroundings was so great that even her love of flamboyant and revealing outfits could not hamper her ability to move unnoticed.
Rosa and her sister Luisa joined the Assassins willingly when their father swore loyalty to them on behalf of the Thieves' Guild.
- "Rosa" is an Italian and Spanish name meaning "rose." "Gallego" is a Spanish regional surname denoting someone from Galicia.
- Like Luisa, Rosa shares her character design with the Dama Rossa Animi Avatar in Abstergo Industries' primary stage of the Animi Training Program, with her outfit based on concept art of the Dama's Elite gear.