Short answers, pulled from the story.
Mary Percy, Countess of Northumberland, was an English noblewoman and courtier who lived during the reign of Henry VIII and died on the 16th of April 1572. She was born Mary Talbot, daughter of George Talbot, 4th Earl of Shrewsbury, and became Countess when her husband Henry Percy succeeded to the earldom on the 19th of May 1527.
Cardinal Thomas Wolsey broke up the affair between Henry Percy and Anne Boleyn by invoking Percy's precontract with Mary Talbot, to whom he had been betrothed since 1516. Percy's father, the 5th Earl of Northumberland, was summoned to court and then took Percy north to Alnwick Castle to separate him from Anne. The marriage to Mary followed, with the date estimated between September 1523 and August 1526.
Mary Percy petitioned for an annulment in June 1532, arguing that her husband had a precontract with Anne Boleyn that invalidated their marriage. Henry VIII personally questioned Percy about the claim, but Parliament rejected the petition and the couple remained legally married.
Mary Percy was born Mary Talbot, one of eleven children of George Talbot, 4th Earl of Shrewsbury, and his first wife Anne Hastings. Her maternal grandmother Katherine Neville was a younger sister of Richard Neville, 16th Earl of Warwick, and her paternal grandmother Catherine Stafford was the daughter of Humphrey Stafford, 1st Duke of Buckingham.
Henry Percy, 6th Earl of Northumberland, died on the 30th of June 1537, many years before his wife Mary, who survived until the 16th of April 1572.
In her later years, Mary Percy was suspected of being a Roman Catholic, of favouring Mary, Queen of Scots, and of hearing mass in her own house. She died in 1572 and was buried in Sheffield church, having received a grant of abbey lands from the Dissolution of the Monasteries during her widowhood.