Kuyavia (Polish: Kujawy; Latin: Cuiavia), also referred to as Cujavia, is a historical region in north-central Poland, situated on the left bank of Vistula, as well as east from Noteć River and Lake Gopło. It is divided into three traditional parts: north-western (with the capital in Bydgoszcz, ethnographically distinct), central (the capital in Inowrocław or Kruszwica), and south-eastern (the capital in Włocławek or Brześć Kujawski).
Casimir I of Kuyavia (Polish: Kazimierz I kujawski; c. 1211 – 14 December 1267) was a Polish prince and a member of the House of Piast. He was Duke of Kujawy after 1233, ruler over Ląd from 1239-1261, ruler over Wyszogród after 1242, Duke of Sieradz from 1247-1261, Duke of Łęczyca after 1247, and Duke of Dobrzyń after 1248.
He was the second son of Konrad I of Masovia and his wife Agafia of Rus. He was probably named after his grandfather, Casimir II the Just.
The Diocese of Włocławek (Latin: Dioecesis Vladislaviensis) is a Latin Church ecclesiastical territory or diocese of the Catholic Church in Poland. It is a suffragan in the ecclesiastical province of the Metropolitan Archdiocese of Gniezno. Until the 20th century, it was known as the Diocese of Kujawy.
The bishops' seat is Włocławek Cathedral, also a minor basilica: Bazylika Katedralna Wniebowzięcia NMP in the city of Włocławek, in Kujawsko-Pomorskie.
The diocese has two more Minor Basilicas:
Gopło ([ˈɡɔpwɔ]) is a ribbon lake in Kuyavian-Pomeranian Voivodeship, north-central Poland, near the city of Gniezno. It gives its name to the protected area called Gopło Landscape Park.
Gopło is the largest natural water reservoir in the Kuyavian-Pomeranian Voivodeship and the historical Kujawy region, being the eleventh largest lake in modern Poland.