Anv ofisiel ar stad e oa '''Rouantelezh Pologn andha theDugelezh Grand Duchy of LithuaniaLituania''' ({{lang-pl|''Królestwo Polskie i Wielkie Księstwo Litewskie}},'' {{lang-lt|e poloneg; ''Lenkijos Karalystė ir Lietuvos Didžioji Kunigaikštystė}},'' e lituaneg; {{lang-ua|''Королівство Польське та Вели́ке кня́зівство Лито́вське''}} en ukraineg, {{lang-be|''Каралеўства Польскае і Вялікае Княства Літоўскае''}}).Priore to the 17th century, international treaties and diplomatic texts referred to it by its Latin name {{lang|la|''Regnum Poloniae Magnusque Ducatus Lithuaniae''}}. In the 17th century and later it became known as '''the Most Serene Republic of Poland''' (Polish {{lang|pl|''Najjaśniejsza Rzeczpospolita Polska''}}, Latin {{lang|la|''Serenissima Res Publica Poloniae''}}belaruseg).<refname="Ferrand"/> Its inhabitants referred to it in everyday speech as "[[Rzeczpospolita]]" ([[Ruthenian language|Ruthenian]]: ''Рѣч Посполита'', Lithuanian {{lang|lt|''Žečpospolita''}}). Western Europeans often simply called it '''Poland''', applying the ''[[pars pro toto]]'' synecdoche. The widespread term 'Commonwealth of the Two Nations' ({{lang|pl|Rzeczpospolita Obojga Narodów}}) was coined in the 20th century.<ref>Although the terms {{lang|pl|''Rzeczpospolita''}} (Commonwealth/Republic) and {{lang|pl|''Oba Narody''}} (Two/Both Nations) were widespread in the period, and were used in the combined form for the first time only in 1967 in [[Paweł Jasienica]]'s book thus entitled.</ref>
A-raok ar XVIIvet kantved e veze graet gant an anv latin en emglevioù etrebroadel ha skridoù diplomatek, dalavarout eo gant ''Regnum Poloniae Magnusque Ducatus Lithuaniae''.
Adal ar XVIIvet kantved e teuas da vout ''' Sichantañ Republik Pologn''' ( ''Najjaśniejsza Rzeczpospolita Polska'' e poloneg, ha ''Serenissima Res Publica Poloniae'' e latin).<ref name="Ferrand"/> An dud a gomze eus "[[Rzeczpospolita]]" ( ''Рѣч Посполита'' e [[ruteneg]], ''Žečpospolita'' e lituaneg}}).
E Kornogeuropa e veze lavaret '''Pologn''' hepmui, oc'h ober gant an doare ''[[pars pro toto]]'' synecdoche. <!--The widespread term 'Commonwealth of the Two Nations' ({{lang|pl|Rzeczpospolita Obojga Narodów}}) was coined in the 20th century.<ref>Although the terms {{lang|pl|''Rzeczpospolita''}} (Commonwealth/Republic) and {{lang|pl|''Oba Narody''}} (Two/Both Nations) were widespread in the period, and were used in the combined form for the first time only in 1967 in [[Paweł Jasienica]]'s book thus entitled.</ref>
