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 of 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.