Bibliotheca Vivens examines processes of knowledge change in the Ottoman Empire between Istanbul and Bucharest within the Household of the Mavrokordatos’ dynasty (1641–1769), focusing on what is assumed to be the most important library in Southeastern Europe in early modernity. Volume I explores intellectual entanglements, framing the oikos of knowledge and the self-fashioning of a Greek Ottoman dynasty in the horizon of the European Republic of Letters. The studies collected in the first section capture knowledge in action, considering how knowledge transfers imply reframing and reconfiguration. The studies in the second section provide contextual insights and perspectives on the episteme in motion. Volume II reconstructs the dispersed book collections of the Mavrokordatos’ Oikos, compiling an impressively rich and diverse alphabetical catalogue, which the BV volumes seek to page through – thus filling a major gap in the existing literature. This reconstruction provides a basis for interpreting early Phanariot knowledge configurations, particularly Nikolaos Mavrokordatos’ political and intellectual project. A Phanariot prince of Moldavia and Wallachia, representative of the so-called Ottoman Tulip Age and correspondent of the European Republic of Letters, Nikolaos engages in a commercium librorum that connected the Ottoman Empire with Amsterdam, Leipzig, London, Paris, Vienna and Venice.