 Following a Celtic (after c. 450 BC) and a Roman (9 BC - c. 4th century) period, the foundation of Hungary was laid in the late Ninth Century by the Magyar chieftain Árpád, whose great grandson István ascended to the throne with a crown sent from Rome in 1000.The Kingdom of Hungary existed with minor interruptions for more than 900 years, and at various points was regarded as one of the cultural centers of the Western world.It was succeeded by a Communist era (1947–1989) during which Hungary gained widespread international attention regarding the Revolution of 1956 and the seminal move of opening its border with Austria in 1989, thus accelerating the collapse of the Eastern Bloc.