Donji Kraji

Donji Kraji ("Lower Regions" or "Lower Ends") or Olfeld (In Hungarian), known in Latin as Partes inferiores ("Lower Parts"), was a small medieval region in present-day northwestern Bosnia and Herzegovina, corresponding roughly to Bosanska Krajina.

At first, Donji Kraji referred to a region around Ključ on the Sana. From the 13th century on, the region was more often called Donji kraji Slavonije than Donji kraji Bosne or Donji kraji Bosanski. The territory of Donji Kraji in the 13th century included the parishes: Uskoplje, Pliva, Luka, Vrbas, Zemljanik (Resnik), Vrbanja, Tribava (Trijebovo), Mel, Lušci and Banjica. During the reign of Hrvoje, Donji Kraji merged with Sana, Glaž, Vrbas (which has since been lost), and briefly Dubica.

In a bull (decree) by King Bela IV of Hungary dated July 20, 1244, some properties were assigned (giving the right of tithe collection) to the Bishop of Bosnia: Usora, Soli, and Olfeld. This took place during the term of Bosnian Ban Matej Ninoslav (r. 1232-50). Vjekoslav Klaić placed the territory of Olfeld west of Usora, based on the 1244 document and citing Konstantin Josef Jireček, who described it to be in the northwest (of medieval Bosnia), towards Croatia, encompassing Kotor on the Vrbanja, Jajce and Ključ on the Sana.

Hrvatin Stjepanić (Latin: Hrovatinus; fl. 1299–1304) was mentioned as the knez ("count") in "the lower confines of Bosnia" (de inferioribus Bosne confinibus) in 1301, and was a vassal of Paul I Šubić of Bribir.

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