I think that hands-down, Sun Tzu would have been the greatest trader to ever have lived -- for obvious reasons......
LOL... You take a person you've never met, making decisions solely based on what you've read and you make those assumptions... Mind as well, try debating about who the best trader is in ET... I say this because there are Chinese academics claiming that "Art of War" is a collaborative work of multiple generations / students in a school.
Watch the Sopranos. My vote would go to John Von Neumann. as a purely quantitative strategist, he would be quite formidable.
How about I add: Abraham Adalbert Adalhard Agatha Agnes Agnes of Assisi Agnes of Montepulciano Agnes of Poitiers Agricola Aidan of Lindisfarne Akiba Ben Joseph Alban Allen, Richard Anselm of Canterbury Aquinas, Thomas Arminius, Jacobus Arrupe, Pedro Augustine of Canterbury Augustine of Hippo Ba'al Shem Tov Baeck, Leo Barbara Barth, Karl Bartholomew I Becket, Thomas Bede the Venerable Beecher Family Bellarmine, Saint Robert Benedict Biscop Benedict of Aniane Benedict of Nursia Benedict the Black Benen Benjamin, Saint Bernard of Clairvaux Bibiana Boesak, Allan Boniface Boniface VIII Brennan, Francis Joseph, Cardinal Brewster, William Buber, Martin Buddha Cabrini, Mother Cajetan of Thiene Calvin, John Carroll, John (1735-1815) Christina the Astonishing Clements, George Confucius Cranmer, Thomas Dalai Lama David Dominic Dympna Eddy, Mary Baker Edwards, Jonathan England, John Farrakhan, Louis Finkelstein, Louis Fox, George Francis of Assisi Ghazali, Al- Graham, Billy Gregory, Popes Harris, Barbara Clementine Hus, Jan Hutchinson, Anne Innocent III, Pope Jeremiah Jesus Christ Joan Joan of Arc John Paul, Popes John XXIII Judson, Adoniram Julius II Kimball, Spencer Knox, John Kobo Daishi, or Kukai Lao-Tzu Latimer, Hugh Lefebvre, Marcel Leo, Popes Loyola, Ignatius of Luther, Martin Mahavira Maimonides Mary Mather Family Meyendorff, John Moody, Dwight L. Moses Mott, John R. Muhammad Muhlenberg Family Newman, John Henry Nichiren Nirmala, Sister Ockham, William of Pascal, Blaise Patrick Paul (Ad 10?-67?) Paul VI Pedersen, Christiern Peter Philo Pius, Popes Ramanuja Rashi Ricci, Matteo Russell, Charles Taze Sa`adia Ben Joseph Savonarola, Girolamo Schweitzer, Albert Seton, Mother Smith, Joseph (1805-44) Ssderblom, Nathan Solomon Swedenborg, Emanuel Tanenbaum, Marc Teresa, Mother Tillich, Paul Tomasek, Frantisek Ulfilas Urban, Popes Weber, Max (1864-1920) Wesley, John Whitefield, George Wovoka Wycliffe, John Xavier, Francis Ximenes, or Jim*nez, De Cisneros, Francisco Young, Brigham Zwingli, Huldrych And finally... Jack Hershey.
Next best, obviously, Mr. Spock.... "When every other possible alternative has been eliminated... what remains, regardless of how improbable it seems, is correct..."