It's not easy to write research proposals, so look for the topic or idea that you're familiar with, and there should be many books and other resources available on your chosen subject. You may end up with wasted time and frustration if the topic you choose doesn’t support the entire study. Do you have many exciting ideas? Well, they are not important if they don't fit into your research. Don't hesitate to go with other research proposal topics if you have this problem, choose at least a few of them in the beginning, and pick the one supported with a lot of information and academic materials.
Much of our information on Columbus derives from two questionable sources: Historie della vita et dei fatti dell’ ammiraglio don Cristoforo Colombo — first published (Venice. 1571) under the name of Fernando, Columbus’ natural son, by Alfonso Ulloa (thirty-two years after the presumed, and still missing, original); and historia de lad Indias, by Bartolomeo de Las Casas (1474-1566). who began the work in 1527 and completed the final draft in 1553; it was finally published at Madrid in 1875-1876. The authorship and history of these two sources has long been debated. Henri Harrisse (1872) revealed many inconsistencies and contradictions in the Historie and concluded that it could not have been written by Fernando Columbus. His argument has been largely discredited, and Alberto Magnaghi has shown in the compilation of the Historie the responsibility of an anonymous author, probably Luis Colon, a descendant of Columbus who was exiled to Oran by Charles V. Various legendary details were inserted into the Columbian tradition: Columbus’ having graduated from the University of Pavia. the mention of other admirals in his family, and an account of a voyage to Tunis that portrays Columbus as a nautical buffoon and a shameless inventor of fairy tales. He also was reputed to have made an equally fanciful voyage to lceland and beyond in 1477. One must be wary in using these sources, for dates and personages often are confused.