[1] During the rule of Grand Master Juan Fernández de Heredia, a fellow Aragonese, he spent time at the Hospitaller headquarters in Rhodes.
[2] One of three coats of arms carved into the lintel above the doorway to the chapel of Saint George on Rhodes has been tentatively identified as Íñigo's.
[2][4] Íñigo was appointed castellan or captain of Smyrna, a city in western Anatolia and one of the last crusader outposts in Asia, probably on 1 March 1401.
That same year, the Avignonese pope Benedict XIII appointed him ambassador of the Holy See to the court of King Martin I of Sicily in 1407.
The castellan of Amposta, Pedro Ruiz de Moros, the most powerful Hospitaller in Aragon strongly favoured the candidacy of James II, Count of Urgell.
[7] When a second parliament convened at Alcañiz, Íñigo shared responsibility for the defence of the town with the castellan, Guillem Ramon Alemany de Cervelló, a grand commander of the Order of Calatrava.
[8][9] Íñigo attended the final parliament met at Caspe, and was present when the famous compromise was publicly read on 28 June 1412.
The Catalan corts that met in Tortosa in 1413 summoned Íñigo as "the regent of the Castellany of Amposta" (regenti Castellaniam Emposte).
[10][11] He was still regent in Amposta as of 11 January 1416, but shortly thereafter Pedro Ruiz was deposed and Gonzalo de Funes appointed in his place.
Íñigo and another Hospitaller, Pascasi de Morralla, prior of Monzón, were charged by the tribunal with conducting an inquiry "into the said lord Fray Pedro, castellan, and his houses and rooms in various places in the said castellany" (in dicto domino fratre Petro, castellano, et suis castris seu cameris ac locis dicte Castellanie).