Fitzsimon,Walter an Irish prelate, was a bachelor of civil and canon law, a learned divine and philosopher, precentor of St. Patrick's Church, whose chapter he represented as proxy in a parliament of 1478. On June 14, 1484, he was appointed to the see of Dublin, and consecrated in St. Patrick's Cathedral, September 26 following. In 1487 this prelate was one of those who espoused the cause of Lambert Simnel, and were accessory to his coronation in Christ Church in 1488 Fitzsimon was permitted to renew his allegiance, and receive pardon through Sir Richard Edgecombe. In 1492 this prelate was made deputy to Jasper, duke of Bedford. While in this situation he endeavored to promote industrious habits among the more indolent of the people. In 1496 he held a provincial synod in the Church of the Holy Trinity, on which occasion all annual contribution for seven years was settled by the clergy of the province, to provide salaries for the lecturers of the university in St. Patrick's Cathedral. In May of the same year he granted to John Alleyne, dean of St. Patrick's, license to build a hospital for the relief of poor Catholics. In 1508 he was deputy to Gerald, earl of Kildare, and in 1509 lord-chancellor. He died May 14, 1511, at Finglass. See D'Alton, Memoirs of the Abps. of Dublin, page 171.