'Constance', 1890. Konstanz Cathedral in Konstanz on the river Rhine flowing into Lake Constance, by the late Middle Ages,about a quarter of inhabitants were exempt from taxation on account of clerical rights. In 1192, Konstanz gained status of Imperial City subject only to the Holy Roman Emperor. From "Cassell's Illustrated Universal History, Vol. III - The Middle Ages", by Edmund Ollier. [Cassell and Company, Limited, London, Paris and Melbourne, 1890. ]