It is March 15, one of the most famous days in history, owing to March 15, 44 BC, when a group of Roman senators chose to express their disagreement with Julius Caesar' by stabbing him twenty three times. Since that time March 15 has often been perceived as a day of ill omen. Ill omen or no, it is certainly a day on which much has occurred in history.
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.