Ciarán of Clonmacnoise was an early Irish saint and the founder of the monastic site at Clonmacnoise in the 6th century. He is known for his dedication to Christianity and his role in spreading the faith throughout Ireland. Ciarán is often celebrated for his piety and leadership, attracting many followers to his monastery. His feast day is observed on March 5th, and he is considered one of the twelve apostles of Ireland. Ciarán's legacy includes the establishment of a significant center of learning and culture, which played a vital role in the preservation of Irish Christianity and literature.