The topic of the diploma thesis is the activity of the Cistercian monastic order in the area of Tuscany. During the main wave of founding the Cistercian monasteries in Italy, the area of Tuscany, whose medieval boundaries roughly correspond to its current ones, was under major political influence of Florence, Siena, Pisa and Lucca. Most monasteries in the region were founded in the vicinity of these cities. This work aims to contribute to the discoveries about the influence of these cities and their elites on the establishing of foundation of the white monks in Tuscany. The goal of this work is an analysis of circumstances and causes of the arrival of the Cistercians in the Tuscany region, where they arrived relatively late, compared to other Italian regions. The work focuses on the specificities of the Cistercian movement of the foundation of monasteries. The fist Cistercian foundation in Tuscany was the monastery San Galgano. Most of the Cistercian abbeys in the region predominantly from the 13th century was affiliated with San Galgano. The diploma thesis aims to describe the development of the Cistercian order and its monasteries in the area by exploring specific Cistercian foundations in Tuscany. Possibly the most important monastery in the region was San Galgano, which served as the maternal monastery...