This book investigates the life and ministry of the German Pentecostal pioneer Jonathan Paul (1853-1931) to assess his influence on the Pentecostal Movement in Germany and Europe. It traces his theological development as a Lutheran pastor and evangelist in the nineteenth century Holiness Movement, his role in the Gnadau Union and his contentious perfectionist doctrine. Paul's subsequent adherence to Pentecostalism is the main focus and includes the unimaginable condemnation of the man, his teachings and of Pentecostals in general by German Evangelical Leaders in the Berlin Declaration of 1909. The Pentecostal Movement's rapid and widespread growth in Germany is studied, revealing an ecumenical outlook and charismatic identity that exerted a major influence on other contemporary Pentecostal leaders in Europe and beyond.