question: Who is William Paulet, 4Th Marquess Of Winchester's paternal grandmother?
context: Title: William Paulet, 3rd Marquess of Winchester
  Passage: William Paulet, 3rd Marquess of Winchester( 1532 – 24 November 1598) was an English nobleman, the son of John Paulet, 2nd Marquess of Winchester and his first wife, Elizabeth Willoughby. His maternal grandfather was Robert Willoughby, 2nd Baron Willoughby de Broke. He was made a Knight of the Bath at the coronation of Mary I on 30 November 1553.
  Title: William Paulet, 4th Marquess of Winchester
  Passage: William Paulet, 4th Marquess of Winchester( bef. 1560 – 4 February 1629) was an English nobleman, the son of William Paulet, 3rd Marquess of Winchester and Anne or Agnes Howard. He was styled Lord St. John from 1576 to 1598. He was summoned to Parliament on 16 January 1581 in his father's barony as Lord St. John. On 24 November 1598, he succeeded his father as 4th Marquess of Winchester. Paulet experienced great financial difficulties arising from his magnificent style of living and his lavish entertainment of Elizabeth I at Basing House.
answer: Elizabeth Willoughby
citations: William Paulet, 4th Marquess of Winchester William Paulet, 3rd Marquess of Winchester