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. Since the 17th century, in international relations, it was usually known as the Most Serene Republic of Poland, Serenissima Res Publica Poloniae. Locally it was called Rzeczpospolita – […]
Res Publica 