Germany and Scandinavia, as well as Roman territories of Germania by the first century AD. It had a pantheon of deities that included Donar/Thunar, Wuotan/Wodan, Frouwa/Frua, Balder/Phol/Baldag, and others shared with northern Germanic paganism. Celtic paganism and later Gallo-Roman syntheses were instead practised in western and southern parts of modern Germany, while Slavic paganism was practised in the east. Late Roman and Carolingian eras (300–1000) In the territories of Germany under the control of the Roman Empire (the provinces Raetia, Germania Superior and Germania Inferior), early Christianity was introduced and began to flourish after the fourth century. Although pagan Roman temples existed beforehand, Christian religious structures were soon built, such as the Aula Palatina in Trier (then the capital of the Roman province Gallia Belgica), completed during the reign of Roman emperor Constantine I (306–337). During the Carolingian period, Christianity spread throughout Germany, particularly during the reign of Charlemagne (r. 768–814). Religious structures built during the Carolingian period include the Palatine Chapel, Aachen, a surviving component of the Palace of Aachen built by architect Odo of Metz during the reign of Charlemagne. Pre-Reformation period (1000–1517) Territories of the present-day Germany, like much of Europe, were entirely Roman Catholic with religious break-offs being suppressed by both the Papacy and the Holy Roman Emperor. Reformation, Counter-Reformation and the Thirty Years' War (1517–1648) Roman Catholicism was the sole established religion in the Holy Roman Empire until the advent of the Protestant Reformation changed this drastically. In the early 16th century abuses (such as selling indulgences in the Catholic Church) occasioned much discontent, and a general desire for reform emerged. In 1517 the Reformation began with the publication of Martin Luther's 95 Theses detailing 95 assertions which Luther believed showed corruption and misguidance within the Catholic Church. The Reformation demonstrated Luther's disagreement both with the way in which the higher clergy used and abused power, and with the very idea of a papacy. In 1521 the Diet of Worms outlawed Luther, but the Reformation spread rapidly. Luther translated the Bible from Latin to German, establishing the basis of the modern German language. A curious fact is that Luther spoke a dialect which had minor importance in the German language of that time. After the publication of his Bible translation, his dialect evolved into what is now standard modern German. With the protestation of the Lutheran princes at the Imperial Diet of Speyer (1529) and