What are the roles that Prince Henry of Portugal, Vasco da Gama, Christopher Columbus and finally Ferdinand Magellan played in this growth of European exploration and discovery?

an early twentieth-century ad for model home blueprints

how is this a question? but yes, they were. if i recall correctly, it was very handy for native americans to use buffalo skin.

the exodus of these people from constantinople contributed to the revival of greek and roman studies, which led to the development of the renaissance in humanism and science. byzantine emigrants also brought to western europe the better preserved and accumulated knowledge of their own greek civilization