By 1274, he was back in Europe. He attended the Second Council of Lyon and at the first session on 7 May was commissioned by Pope Gregory X to write a report on recovering lost territory in the Holy Land. It is probable that he had met the future pope on his mission to the Holy Land in 1271. Fidentius appears to have visited the convent of Saint Anthony in Padua in 1283. He was back in the Holy Land again in 1289, when he visited the prisoners-of-war after the fall of Tripoli on 26 April. It was only in 1290 or 1291, shortly before the fall of Acre, that he delivered his report, "Liber recuperationis Terre Sancte", to Pope Nicholas IV. The report was probably written in the Holy Land, mainly in Acre. He was still there in February 1290, since he refers to the invasion of Cilician Armenia that took place that month in his "Liber".