Ebles II (died May 1103), also called Eble or Ebale, was the second Count of Roucy (1063–1103) of the House of Montdidier. He was the son and successor of Hilduin IV of Montdidier and Alice (Alix), daughter of Ebles I of Roucy. He is famous for his participation in the Reconquista (the war against Muslim Spain), as well as for being one of the unruly barons of the Île-de-France subjugated by King Louis VI while he was still a prince. His life and character are summed up by Suger in his history of the reign of Louis VI: "Ebles was a man of great military prowess—indeed he became so bold that one day he set out for Spain with an army of a size fit only for a king—his feats of arms only made him more outrageous and rapacious in pillage, rape and all over evils."
On 30 April 1073 Pope Gregory VII authorised a new crusade against the Muslims in Spain. (The Barbastro Crusade of a decade earlier had failed to achieve anything lasting.) In the bull, addressed to "all the princes [rulers] in the land of Spain", Gregory asserted Papal suzerainty over the Iberian peninsula—"we believe the kingdom of Spain to have been from antiquity the rightful property of Saint Peter"—and informed them that he had ceded this right to Ebles of Roucy. The negotiations between Ebles and the Holy See had been conducted by Gregory as legate before he became Pope on 22 April, and his letter makes clear there had been prior letters between Ebles and Pope Alexander II. Ebles made a pact (pactio) with the Holy See whereby the lands he conquered in Spain would be held by him as a Papal fiefdom "for the honour of Saint Peter". Four fragments of bulls issued by Alexander granting the plenary indulgence for engaging in a holy war have been customarily dated to the campaign against Barbastro (1063–64) but may belong to that of Ebles.