The official name of the country was Kingdom of Poland and Grand Duchy of Lithuania. It was referred to in Latin as Regnum Poloniae Magnusque Ducatus Lithuaniae. more at The Most Serene Republic – Kingdom of Poland and Grand Duchy of Lithuania « Res Publica.
Long, long time ago people used to live in caves. First houses didn’t differ much from barns. The development of buildings to what we know them to be today took centuries of changing styles, new inventions, and attitudes towards life comfort. more at House « British Architecture