Among the illustrious figures that guested or lived in Poland at the time were Bartholommeo Berecci, Francesco Fiorentino, Santi and Mateo Gucci, Bernardo Morando, Giovanni Battista di Quadro and Hans Dürer. Most of the decorators working for the court were foreigners, especially Italians and Germans who had a profound impact on Poland's architecture as a whole. The centrepiece of their work is Wawel Castle in Kraków, the seat of Polish monarchs as well as one of the largest castles in Central Europe. Situated on a hill overlooking Old Town, the fortified residence was extensively reconstructed in the Renaissance style and to the personal needs of the royal family. The Italian cloistered courtyard in the shape of a quadrangle, corridors, archways and portals were designed by Fiorentino with the help of Benedykt from Sandomierz. A similar design was undertaken in Niepołomice Castle, the hunting retreat of the Jagiellons.