INTRODUCTION // Ryszard Skowron : The House of Vasa and the House of Austria: Correspondence from 15871668. Project description ...21 // José Martinez Millan : The Habsburg Dynasty during the Seventeenth Century: The Ideological Construction of a Universal Political Entity ...37 // Ryszard Szmydki : Sigismund III Vasa and the Netherlands ...69 // Miguel Conde Pazos : The Hispanic Monarchy Facing the Accession of the Vasa Monarchy. Don Guillen de San Clemente’s Embassy to Poland (1588-1589) ...95 // Rubén Gonzales Cuerva : The Spanish Embassy in the Empire, Watchtower of Poland (1590-1624) ...115 // Tomasz Poznański : "Amicitia, sed ..." - Friendship, Raison d’état, and Political Compromise. Relations between Sigismund III Vasa and the Habsburg Emperors in 1613-1632 ...145 // Manuel Rivero Rodriguez : The Kingdom of Naples in the Spanish Monarchy and Its Relationship with Poland ...187 // Abbrevations ...205 // Correspondence // ... ... ...