brownist

from The Century Dictionary.

• noun A follower of Robert Brown or Browne (about 1550–1633), a Puritan, who first organized the body of dissenters from the Church of England afterward called Independents. See Congregationalist.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Eccl. Hist.) A follower of Robert Brown, of England, in the 16th century, who taught that every church is complete and independent in itself when organized, and consists of members meeting in one place, having full power to elect and depose its officers.
• noun (Med.) One who advocates the Brunonian system of medicine.