As a ruler, Alfonso showed legislative capacity, and a wish to provide the kingdoms expanded under his father with a code of laws and a consistent judicial system. The "Fuero Real" was undoubtedly his work. He began medieval Europe's most comprehensive code of law, the "Siete Partidas", which, however, thwarted by the nobility of Castile, was only promulgated by his great-grandson. Because of this, and because the "Partidas" remain fundamental law in the American Southwest, he is one of the 23 lawmakers depicted in the House of Representatives chamber of the United States Capitol.