Sea in culture of barbarian invaders and knowledge of geography took a backward step. In the seventh century, Isidore of Seville produced a "wheel map" in which Asia, Africa and Europe were arranged like segments in an orange, separated by the "Mare Mediterranean", "Nilus" and "Tanais" and surrounded by "Oceanus". It was not until the fifteenth century that Ptolemy's maps were used again and Henry the Navigator of Portugal initiated ocean exploration and maritime research. Encouraged by him, Portuguese navigators explored, mapped and charted the west coast of Africa and the Eastern Atlantic and this knowledge prepared the way for the great voyages
How Europe Underdeveloped Africa How Europe Underdeveloped Africa How Europe Underdeveloped Africa is a 1972 book written by Walter Rodney that takes the view that Africa was deliberately exploited and underdeveloped by European colonial regimes Rodney argues that a combination of power politics and economic exploitation of Africa by Europeans led to the poor state of African political and economic development evident in the late 20th century. Though, he did not intend "to remove the ultimate responsibility for development from the shoulders of Africans... [He believes that] every African has a responsibility to understand the [capitalist] system and work for its overthrow." First published