Watch for these twin towers crowned with green copper cupolas on Grodzka Street during your walking tour. This is the Church of St. Andrew, one of the oldest buildings in the historic district. It was founded by Palatine Sieciech during the late 11th century. He was a powerful, wealthy and sometimes unscrupulous count. As a consequence of his long enemy list, the church’s Romanesque design doubled as a fortress. During the Middle Ages, the Roman Catholic church was tagged as the “lower castle.” The stone façade and defenses successfully repelled an attack by the Mongols in 1241. In 1325, a monastery for the Order of Saint Clare was added. The Poor Clares were founded by Clare of Assisi and Francis of Assisi in 1212.