Alexander Koller's magisterial edition of the German Apostolic Nunciature reports of Orazio Malaspina and Ottavio Santacroce, as well as the interim of Cesare dell'Arena, forms the tenth volume in the series Nuntiaturberichte aus Deutschland sponsored by the German Historical Institute in Rome. Although the introduction and synopses are in German, the actual correspondence is in Italian. To make this work possible, extensive research was done in numerous archives, especially the Archivio Segreto Vaticano and the Haus-, Hof- und Staatsarchiv in Vienna. Koller presents a superb introduction not only to the nuncios, but also to the most prominent players and events at the court of Emperor Rudolph ii from 1578 to 1581. This volume offers scholars a rich opportunity to access the political and religious climate of the imperial court of Rudolph ii in Prague during this period. For instance, the correspondence reveals important details between the Bohemian Estates and Rudolph ii over confessional issues. Besides covering a critical period in the confessional age of Central Europe in general, it also offers interesting insights into the wider early modern world: for example, the nuncios’ efforts to have Rudolph address the presence of ‘heretical’ books in Constantinople. Likewise, the nuncios refer to the Livonian War between Poland-Lithuania under István Báthory and Russia under Czar Ivan iv in which both parties hoped that Rudolph would intervene. Finally, this volume provides excellent primary source material for women's history in the early modern era, especially for Rudolph's mother, Maria of Spain.