One means of dealing with human remains that seems bizarre today is the ossuary- the disinterment, collection, and often decorative display, of human bones. The macabre practice might seem bizarre to the modern world, but it is surprisingly common throughout history, occurring on multiple continents and in multiple cultures from prehistory to surprisingly modern times.
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.