This was the house of worship for the Free "Fighting" Quakers, a group that broke away from the Society of Friends to take up arms against the British during the Revolutionary War. The building was designed in 1783 by Samuel Wetherill, one of the original leaders of the group, after they were disowned by their pacifist brothers. Among the 100 members were Betsy Ross (then Elizabeth Griscom) and Thomas Mifflin, a signer of the Constitution. After the Free Quaker group dissolved (many left to become Episcopalian), the building was used as a school, library, and warehouse. The meeting house, built in the Quaker plain style with a brick front and gable roof, has been carefully restored.