William Penn 
A Brief Account of the Rise and Progress of the People Called Quakers [EPUB ebook] 

William Penn was the prominent philosopher and early Quaker who founded the Province of Pennsylvania.  Penn was one of the earliest known advocates of democracy and religious freedom and he also helped develop city of Philadelphia.  Penn was also a prolific writer and his book No Cross, No Crown is a Christian classic. 

A Brief Account of the Rise and Progress of the People Called Quakers provides an excellent look at the history surrounding the Quaker movement.