Lectionary studies were almost abandoned after the mid-twentieth century, and the recent revival of interest in the Greek Lectionary has concentrated exclusively on the Gospel Lectionary. Gibson reintroduces the value of the Apostolos yet incorporates modern methodology in order to build upon the work of recent Lectionary scholarship, analysing New Testament and liturgical textual traditions together, both compilation and continuous text. Through this process, it is shown that the Apostolos witness is not usually copied to another and that consequently there is no 'Lectionary text' of Acts and Paul. Instead, Apostolos copies reflect textual variation in the evolving Byzantine tradition. This study concentrates on the Apostolos in its scribal, monastic, liturgical, and theological context as well as in light of other manuscript traditions.