The Iberian Queen Sancha (r.1037-1065), of the kingdom of León and Castile has received minimal attention from scholars. As the last Leonese heir, Sancha had the sole responsibility of ensuring that imperial traditions of patronage never waned. Her acts of giving and the commissioning of objects have been attributed by (male) scholars as an obligation to legitimize her husband, Fernando I of Castile. Persuasive evidence found in documents suggests that her involvement in donation transactions was predicated on more than formality. My thesis argues that Sancha used the act of giving, the act of commissioning objects, language in documents, and the powerful institution of the infantazgo, to assert an agency identical to her male predecessors to gain political influence. Creating a “donor profile” of Sancha that examines the total of her donating practices enables the exploration of her conscious and unconscious motives for donation. My investigation into these acts supports a new theory that the building construction projects of Sancha and Fernando I began at the beginning of their reign rather than after 1053 as is currently believed. As the first woman to use the titles regine emperatriz and regina totius Hispaniae, Queen Sancha did more than just legitimize her husband, she built a legacy that established a new female center of power in León that endured until the thirteenth century.