I suspect that not one in a thousand Americans is familiar with the work of the National Advisory Committee on Aeronautics, and that is truly a tragedy, because the committee had an outsized effect that played a critical role in winning the Second World War, and shepherding the US into the Jet Age.
The Reconquista, or Christian reconquest of Iberia, took nearly 800 years. The fighting did not come without great attempts by Muslim powers across the strait trying to reestablish their presence in mainland Europe. The last gasp of that effort came in the 1330s, when the powerful Marinid sultanate of what is modern Morocco invaded in an attempt to reverse Christian gains and secure the perilous position of the Sultanate of Granada.