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As Lusatia is not, and never has been, a single administrative unit, Upper and Lower Lusatia have different, but in some respects similar, histories. The city of Cottbus is the largest in the region, and though it is recognized as the cultural capital of Lower Lusatia, it was a Brandenburg exclave since 1445. Historically, the administrative centres of Lower Lusatia were at Luckau and Lübben, while the historical capital of Upper Lusatia is Bautzen. Since 1945, when a small part of Lusatia east of the Oder–Neisse line was incorporated into Poland, Żary has been touted as the capital of Polish Lusatia.