Remaclus was a seventh-century monk, abbot, and bishop active in the Frankish kingdom of Austrasia, remembered above all as the founder of the twin abbeys of Stavelot and Malmedy and as a bishop of Maastricht. By tradition he was a native of Aquitaine who grew up at the ducal court there and received his early formation under Sulpicius the Pious, bishop of Bourges. As one of the Western saints of the undivided Church, he is venerated in the Orthodox tradition among the Latin saints of the pre-schism West, with his feast kept on September 3.
According to the sources, Remaclus entered monastic life at Luxeuil Abbey and was later ordained a priest. He was subsequently sent to govern the abbey of Solignac, which had been founded by Eligius, and is named as its first abbot; he was also given charge of the monastery of Cugnon. Brought into the circle of the Austrasian court, he served as an advisor to King Sigebert III, and it was at his urging that the king endowed the double-monastery of Malmedy, traditionally dated to 648, and Stavelot, dated to about 650, over both of which Remaclus presided as abbot.
About 650, when Amandus resigned the see of Maastricht to return to missionary labor, Remaclus was appointed bishop in his place. He is said to have governed the diocese for some twelve years before resigning the episcopate in favor of his disciple Theodard and withdrawing to Stavelot, where he spent his last years. He died at Stavelot, by the most common reckoning around the middle 660s, though the sources differ on the exact year. His relics are kept at the church of St. Sebastian in Stavelot, and he is venerated in both the Orthodox and Roman Catholic traditions.