The high concentration of population around Mbanza Kongo and its outskirts played a critical role in the centralization of Kongo. The capital was a densely settled area in an otherwise sparsely populated region where rural population densities probably did not exceed 5 persons per km2. Early Portuguese travelers described Mbanza Kongo as a large city, the size of the Portuguese town of Évora as it was in 1491. By the end of the sixteenth century, Kongo's population was probably close to half a million people in a core region of some 130,000 square kilometers. By the early seventeenth century the city and its hinterland had a population of around 100,000, or one out of every five inhabitants in the Kingdom (according to baptismal statistics compiled by Jesuit priests). This concentration allowed resources, soldiers and surplus foodstuffs to be readily available at the request of the king. This made the king overwhelmingly powerful and caused the kingdom to become highly centralized.