In the middle of the fifteenth century, the Kongo Kingdom was the most powerful of a series of states along Africa's west coast known as the Middle Atlantic kingdoms. Kongo evolved in the late fourteenth century when a group of Bakongo (Kongo people) moved south of the Congo River into northern Angola, conquering the people they found there and establishing Mbanza Kongo (now spelled Mbanza Congo), the capital of the kingdom. One of the reasons for the success of the Bakongo was their willingness to assimilate the inhabitants they conquered rather than to try to become their overlords. The people of the area thus gradually became one and were ruled by leaders with both religious and political authority.

By the middle of the fifteenth century, the manikongo (Kongo king) ruled the lands of northern Angola and the north bank of the Congo River (present-day Congo and Zaire). Kongo was the first kingdom on the west coast of central Africa to come into contact with Europeans. The earliest such contact occurred in 1483 when the Portuguese explorer Diogo C o, reached the mouth of the Congo River. After the initial landing, Portugal and Kongo exchanged emissaries, so that each kingdom was able to acquire knowledge of the other. Impressed by reports from his returning subjects, Nzinga Nkuwu, the manikongo, asked the Portuguese crown for missionaries and technical assistance in exchange for ivory and other goods.

The ruler who came to power in 1506 took a Christian name, Afonso. He too admired European culture and science, and he called on Portugal for support in education, military matters, and the conversion of his subjects to Christianity. Many historians, in fact, maintain that Afonso behaved more like a "Christian" than most of his teachers. Afonso, therefore, soon came into conflict with Portuguese bent on exploiting Kongo society. The most insidious and lasting aspect of this exploitation was the slave trade.

Not long after Afonso became king, Portugal began to turn its attention to the exploration of Asia and the Americas. As Portugal's interest in another of its colonies, Brazil, increased, its interest in Africa declined. Over time, the Portuguese crown came to view Kongo primarily as a source of slaves. Slaves were used first on the sugar plantations on nearby Portuguese-claimed islands but later were sent mainly to Brazil. Once Kongo was opened to the slave trade, halting or limiting it became impossible. Afonso's complaints to the Portuguese crown about the effects of the trade in his lands were largely ignored. By the 1520s, most of the missionaries had returned to Portugal, and most of the remaining whites were slave traders who disregarded the authority of the manikongo's.

In addition to the slave trade, Kongo faced other challenges in the sixteenth century. After the death of Afonso in the 1540s, the kingdom endured a period of instability that culminated in an upheaval in 1568. This rebellion was long attributed by Portuguese sources and others to the invasion by a group of unknown origin called the Jaga. Others, however, believed that the attack was probably launched by a Bakongo faction opposed to the king that may have been joined or aided by non-Bakongo seeking to gain control over the Kongo slave trade and other trading routes. In any case, the assault on the capital (which had been renamed São Salvador) and its environs drove the king, Alvaro I, into exile. The Portuguese governor of São Tomé, responding to pleas from Alvaro I, fought the invaders from 1571 through 1573, finally ousting them and occupying the area until the mid-1570s.

A few years earlier, Sebastião, the Portuguese king, had granted the area south of the Bakongo as a proprietary colony to Paulo Dias de Novais, an associate of Portuguese Jesuits and an experienced explorer of the West African coast. In 1576, in effective control of the countryside and facing no organized Kongo opposition, the Portuguese founded the town of Luanda, in effect establishing the colony of Angola. Other African leaders, however, continued to resist the Portuguese, and the Europeans only managed to establish insecure footholds along the coast. Concerned that African attacks might impede the stream of slaves to Brazil and Portugal, in 1590 the crown assumed direct control of the colony.

Alvaro I and his successor, Alvaro II, brought stability to the Kongo Kingdom by expanding the domain of their royal authority while keeping at bay encroachment by the Portuguese, whose colony during the late years of the sixteenth century remained confined to the area south of Kongo. But after the death of Alvaro II in 1614, conflicts over access to cultivable land between Kongo and the Portuguese colony of Angola soured formerly amicable relations, and in 1622 the Portuguese governor of Angola launched an attack on Kongo. Although not entirely successful from the Portuguese point of view, the war had a number of lasting effects. First, the colony captured a large number of slaves, which demonstrated how rewarding slave raiding could be. Second, the Portuguese came out of the war convinced of the existence of silver and gold mines in Kongo, a belief that encouraged a series of conflicts between the colonists and the Kongo Kingdom for the next half century. The war also created a xenophobia among the Bakongo of the interior, who drove away many Portuguese. Because the trading system depended largely on the Bakongo, commerce was greatly disrupted, with effects on the Angolan colony as great as those on the Kongo Kingdom.

Adding to Kongo's troubles in the early 1600s was a general dissatisfaction among the Bakongo with their rulers, some of whom were greedy and corrupt. Consequently, conflicts arose over succession to the throne, and more and more sections of the kingdom gained substantial degrees of autonomy and established local control over the trade that had so enriched the monarchy in earlier years.

Data as of February 1989