EN
Since the creation and application of the borough rights the oath formed an important part of life of urban communities. The very act of oath had initially legitimized the status of the urban community as a collective (the oath taken by whole community to the sovereign) and the status of its highest representatives (councilors oath of office to the sovereign or to his representative) and had been consolidating its internal integrity (oath of newly recruited townspeople). Gradually, within the sources we could meet with the spreading practice of application of oath, especially in the area of administration and self-government, and the oath itself had slowly turned into some secularized and formalized variation of its former form and became a part of the bureaucratic practice. Records of oaths, which are preserved in various types of municipal books, thus provide testimony not only about the transformation and development of mechanisms of functioning of urban community from the Middle Ages to Early Modern Times, but also about the development of values and principles on which the idea of urban community was built. The potential of investigation of this sources lies precisely in the possibility of following the practical and theoretical aspects of life in medieval and early modern city.