The largest recorded earthquakes in the history of the US east of the rocky mountains are still somewhat of a mystery to both scientists and historians, but the few first-hand accounts from this then sparsely populated land paint a grim picture indeed.
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.