This is the 6347th most frequent Polish word.
brytanią
"Brytanią" is the instrumental case of "Brytania," meaning "Britain" in English.
Here, 'Brytanią' appears in the instrumental case, used after 'po' to indicate location within the area of Great Britain during travel.
Podróżowałem po Europie, w tym również po Wielkiej Brytanii.
I traveled across Europe, including Great Britain.
Here, 'Brytanii' is the genitive case form, used to indicate possession or relation of the history and culture to Britain.
Interesuję się historią i kulturą Brytanii.
I am interested in the history and culture of Britain.
Here, 'Brytanii' is again in the genitive case, demonstrating association with the music and landscapes.