Ciarán of Saigir was an early Irish saint, believed to have lived in the 6th century. He is often regarded as one of the twelve apostles of Ireland and is associated with the founding of several monasteries, particularly in County Offaly. His life is celebrated in various hagiographies, which recount his pious deeds and dedication to Christianity. Ciarán is known for establishing the monastery at Saigir, which became an important center for learning and spirituality. His feast day is celebrated on March 5th, and he is venerated in both the Catholic Church and the Eastern Orthodox Church. His legacy continues to influence Irish religious culture today.