Born in Madrid to a famous architect and a Catalan aristocrat—making her a Spanish noble— Ágatha began honing her skills in fashion design at the Escuela de Artes y Técnicas de la Moda, Barcelona’s School of Fashion Arts and Techniques. At the age of 20, she began working as an intern at fashion designer Pepe Rubio’s studio. It wasn’t long before she presented her first collection at the Local Design Centre in Madrid in 1981. Soon after, she also exhibited at the Museum of Contemporary Art of Madrid, and from there, her reputation in original, distinctive designs began to spread.