St. Ciarán, also known as Ciarán of Saigir, is one of the early Irish saints, believed to have been born around 512 AD. He is recognized as the founder of the monastic site at Saigir, which is located in County Offaly, Ireland. St. Ciarán is often associated with the spread of Christianity in Ireland and is considered one of the Twelve Apostles of Ireland. His feast day is celebrated on March 5th, and he is known for his piety and dedication to monastic life. St. Ciarán is also linked to various legends, including his connection to other saints like St. Patrick and St. Brendan. His influence is seen in the establishment of monastic communities throughout Ireland.