His father died in 1576, when Donne was four years old, leaving his son fatherless and his widow, Elizabeth Heywood, with the responsibility of raising their children alone. Heywood was also from a recusant Roman Catholic family, the daughter of John Heywood, the Playwright, and sister of the Reverend Jasper Heywood, a Jesuit priest and translator. She was a great-niece of the Roman Catholic martyr Thomas More. This tradition of martyrdom would continue among Donne's closer relatives, many of whom were executed or exiled for religious reasons. Donne was educated privately; however, there is no evidence to support the popular claim that he was taught by Jesuits. Donne's mother married Dr. John Syminges, a wealthy widower with three children, a few months after Donne's father died. Donne thus acquired a stepfather. Two more of his sisters, Mary and Katherine, died in 1581. Donne's mother lived her last years in the Deanery after Donne became Dean of St Paul's, and died just two months before Donne, in January 1631. In 1583, the 11-year-old Donne began studies at Hart Hall, now Hertford College, Oxford. After three years of studies there, Donne was admitted to the University of Cambridge, where he studied for another three years. However, Donne could not obtain a degree from either institution because of his Catholicism, since he refused to take the Oath of Supremacy required to graduate.