The Manifesto of Manzanares (Spanish: Manifiesto de Manzanares) was issued 7 July 1854 in Manzanares, Spain. Drafted by Antonio Cánovas del Castillo and signed by General Leopoldo O'Donnell, it called for political reforms and a constituent Cortes to bring about an authentic "liberal regeneration". General Barracks, Manzanares, 6 July 1854. General in Chief of the Constitutional Army, Leopoldo O'Donnell, Count of Lucena. The country heeded the call, and within weeks the Moderate government had fallen, ushering in the bienio progresista.