Assicus was a 5th-century Irish priest and the inaugural bishop of Elphin. A skilled metalworker, he was a close associate of Saint Patrick, who converted him to Christianity. According to tradition, he served as a craftsman for Patrick, producing various liturgical items from copper and brass. Following the establishment of an episcopal monastery at Elphin, Assicus was appointed as its abbot-bishop. He is remembered both for his spiritual leadership and his expertise as a skilled artisan.