First critical edition of the first and longest book of an important Byzantine anthology This is the editio princeps of the first book of the Florilegium Coislinianum, an important Byzantine anthology dated to the 9th or 10th c. The critical text presented here is based upon a detailed examination of all the known witnesses of the florilegium, and it has been thoroughly compared with its sources. It is supplemented with a philological introduction which studies the manuscript tradition and the relationship of the manuscripts, explains the orthographical peculiarities of the tradition, defines the ratio edendi and discusses the most relevant textual corruptions of the archetype. The Florilegium Coislinianum, which deals with subjects ranging from the creation of angels to sin and virtues, has only recently received full attention from the scholarly community. This edition is part of a much larger collaborative project, in the context of which a research team, based at the KU Leuven, is currently studying and editing diverse sections of this florilegium.