Christopher Columbus was an Italian explorer who made four voyages between Spain and the Americas between 1492 and 1503. These voyages marked the beginning of European colonization of the Americas. Columbus wrongly estimated the distance between Europe and Asia and believed he had reached Asia when he landed in the Bahamas, not realizing he had discovered a new continent. While Columbus opened the door for European colonization, he faced increasing difficulties governing the colonies and was imprisoned for a year due to accusations of tyrannical rule before returning to Spain, where he died still convinced he had reached Asia.