He was celebrating Mass with the family. Immediately after his installation as Lord Mayor of Dublin in 1580, Walter had his mother and her personal chaplain arrested and taken to the dungeons of Dublin Castle. Due to her advanced age and severe arthritis, she had to be transported there by a wooden pallet. When the family protested, Walter declared that his mother should have been executed, but he had spared her. She would be allowed to go free if she "took the Oath", which probably referred to the Oath of Supremacy. Her second son, Nicholas, who supported her, was elected Mayor of Dublin in 1582. However, Walter was still Commissioner for Ecclesiastical Causes, which was a royal appointment. He outranked Nicholas and kept him from securing their mother's release from prison. Nicholas visited her daily, bringing her food, clothing and candles. Ball died in 1584 at the age of sixty-nine, which was an advanced age at the time. She was crippled with arthritis and had lived for three years in the cold, wet dungeon of Dublin Castle with no natural light. When she died she was buried in the cemetery at St. Audoen's Church in Dublin. Although she could have altered her will, she still bequeathed her property to Walter upon her death. Ball had remained in the dungeon when she could have returned to a life of comfort at any time by simply "taking the oath." Two generations later this pattern was repeated when Blessed Francis Taylor, who was Mayor of Dublin (1595–1596) and was married to Gennet Shelton, a granddaughter of Ball, was condemned to the dungeons after exposing fraud in the parliamentary elections to the Irish House of Commons. He likewise refused to "take the oath" and died in Dublin Castle in 1621. Ball and Taylor could not have known each other, but they were beatified together, along with Dermot O'Hurley and 14 other Catholic martyrs, on 27 September 1992 by Pope John Paul II. The Blessed Margaret Ball Chapel in Santry is dedicated to her. Ball, along with St. Columbanus and St. Mary MacKillop RSJ, was named a patron saint of the 50th International Eucharistic Congress held in Ireland in June 2012. December 2004 – Corish and Millett – ""The Irish Martyrs""