Crónán of Rosdalla was an early Irish saint, known for his association with the area of Rosdalla in County Kildare. He is often recognized for his contributions to the spread of Christianity in Ireland during the 6th century. His life and works are celebrated in various hagiographies, which detail his piety and dedication to the faith. The site of Rosdalla is significant in Irish history, featuring a medieval church and a round tower, which are often linked to Crónán's legacy. His feast day is commemorated on January 1, reflecting his importance in the local Christian tradition.