The Duchy of Infantado is a historical title in Spain, established in the late 15th century. It was created for the powerful House of Mendoza, one of the most influential noble families in the country. The duchy is primarily associated with the region of Guadalajara and has played a significant role in Spanish history, particularly during the Spanish Civil War. The title has been held by various members of the Mendoza family, who were known for their vast estates and political influence. Over the years, the duchy has been linked to several important cultural and artistic contributions in Spain, reflecting the wealth and status of its holders.