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Battle of Gagliano

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Background

After years of war (starting with the titular Sicilian Vespers in 1282), in 1299 an alliance of Angevin, Aragonese, and papal forces began to conduct a successful land campaign on the island of Sicily. Led by Aragonese–Sicilian admiral Roger of Lauria and Angevin prince Robert of Anjou, the allied army moved throughout eastern Sicily, attacking cities and towns in an attempt to erode Sicilian resistance. Despite fierce resistance by the Sicilian royal army, by the summer of 1299 the allies had captured the key Sicilian city of Catania, cutting off the major Sicilian cities of Syracuse and Messina in the east while also forcing Frederick II of Sicily to retreat into the Sicilian heartland. Planning on attacking Frederick's remaining forces from both sides, in the fall of 1299 an Angevin army landed at Trapani, seeking to march inland while the allied armies in the east marched west. This approach ended in disaster when in November 1299 the western Angevin army was routed at the Battle of Falconaria. The defeat of the western army caused Roger of Lauria to sail for Naples to procure more men and supplies, leaving Robert to command the Sicilian campaign; before departing, Roger advised Robert to hold off attacking the Sicilians until the spring of 1300.

In early 1300 an Aragonese castellan named Montaner di Sosa started a plot to entrap the Angevins. As part of the plot, di Sosa convinced a prisoner (a French noble named Charles Morelet, who had been captured at Falconaria in November) that he wished to defect to the allied cause, citing his desire to remain loyal to the pope. The noble was then allowed to leak news of di Sosa's alleged defection to Robert, to whom the supposed defector offered to open the gates of the castle of Gagliano. Robert received the intelligence and summoned a council of war to discuss a plan to seize Gagliano; the castle was a tempting target, as it was located close to Frederick's Sicilian army headquarters in Enna. Robert considered leading the attack in person but, heeding the advice of his Aragonese wife that the surrender may be a ruse, placed a junior commander in command.

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