Old Pine was established in 1768 as the Third Presbyterian Church in Philadelphia. One of Old Pine's first pastors, George Duffield, defying British arrest, served as chaplain to the First Continental Congress in 1774, and with many of his parishioners, joined Washington at Valley Forge in the winter of 1776-77. Because of Duffield's activities and those of parishioners such as John Adams, and of the many members who loyally stood with Washington, Old Pine soon became known as the "Church of the Patriots." Today, it remains the only Presbyterian structure in Philadelphia dating back to colonial and revolutionary times. The church also contains a historic burial ground.