Continuing her unique approach to “horizontal history”, Genevieve Foster explores the wide world of William Penn – a world reaching across the courtyards of the Sun King to the Great Wall of China. Penn’s contemporaries included such colorful figures as Louis XIV, Peter the Great, Edmund Halley, Sir Issac Newton, Shah Jahan (who built the Taj Mahal), and the great explorers Marquette, Jolliet, and La Salle. Penn’s life spans a fascinating age of exploration and discovery. Penn’s Quaker beliefs undergirded his relationships with the Pennsylvanian tribes and established the longest standing peace treaty between American Indians and European settlers.