Alcuin (734-804) was the head of Charlemagne's cultural reinvigoration of the west. As lead educator and propogandist for the emperor, Alcuin encouraged literacy and learning in a time of relative stagnation. While not considered an original thinker himself, Alcuin is respected for his support of a broad education, i.e. the seven liberal arts. A staunch churchman, steeped in christian idealism, he would end his days as abbot of the abbey of St. Martin of Tours in France.
Map of Charlemagne's Empire