The Bantu influx began around 500 BC, and some continued their migrations inside the territory well into the 20th century. They established a number of major political units, of which the most important was the Kongo Empire whose centre was located in the northwest of what today is Angola, and which stretched northwards into the west of the present Democratic Republic of the Congo (DRC), the south and west of the contemporary Republic of Congo and even the southernmost part of Gabon.