St. Darerca is said to be the second most popular female saint in Ireland after St. Bridget. She was sister to St. Patrick and had 19 children, many of whom became bishops and saints themselves. She and her children helped St. Patrick evangelize Ireland. They could have made their own congregation!
Not many other specifics are known for certain about her life. I've shown her here with a shamrock on her cowl for each of her children, holding wedding bands for her motherhood and an Irish cross for her evangelizing role with her brother.