" Christianity spread across northern Europe more or less from west to east, slowly, but with greater speed after 950 or so. Ireland was first, in the fifth and sixth centuries; there followed Pictish Scotland, England and central Germany in the seventh century, Saxony – by force as we have seen – after Charlemagne’s conquests in the eighth, Bulgaria, Croatia and Moravia in the ninth, Bohemia in the tenth, Poland, Rus’ (covering parts of European Russia and Ukraine) and Denmark in the late tenth, Norway, Iceland and Hungary in the years around 1000, Sweden more slowly across the eleventh century.3 Only the far north-east of Europe was left out of this, the Baltic- and Finnish-speaking lands, the former of which would eventually, in the thirteenth century, turn into the only large and powerful pagan polity in medieval Europe, Lithuania, before its grand dukes went Christian as late as 1386–87. "

― Chris Wickham , Medieval Europe