Despite its generic title, the treatise is no dry rehearsal of altogether familiar views concerning the virtues and vices of princes. His mirror–of–princes was published under the title De rege et regis institutione libri tres in Toledo in 1599 and dedicated to the new king 3. 4 For the current debate concerning the shift from describing the Habsburg monarchy as a ‘composite m (.)ģMariana chose a traditional genre to give air to his hopes and fears and proffer counsel to Philip III and his advisors.3 Juan de MARIANA, De rege et regis institutione libri tres, Toledo: Pedro Rodríguez, 1599.