Budapest (Hungarian: [ˈbudɒpɛʃt]) is the capital and the largest city of Hungary, and one of the largest cities in Central Europe. It is the country's principal political, cultural, commercial, industrial, and transportation centre, sometimes described as the primate city of Hungary. Budapest became a single city occupying both banks of the river Danube with its unification on 17 November 1873 of Buda and Óbuda, on the west bank, with Pest, on the east bank.
The history of Budapest began with Aquincum, originally a Celtic settlement that became the Roman capital of Pannonia Inferior. Hungarians arrived in the territory in the 9th century. Their first settlement was pillaged by the Mongols in 1241–42. The re-established town became one of the centres of Renaissance humanist culture by the 15th century. Following the Battle of Mohács and nearly 150 years of Ottoman rule, the region entered a new age of prosperity in the 18th and 19th centuries, and Budapest became a global city after its unification in 1873.