The Federal Street Church was a congregational Unitarian church in Boston, Massachusetts. Organized in 1727, the originally Presbyterian congregation changed in 1786 to "Congregationalism", then adopted the liberal theology of its fifth senior minister, William Ellery Channing, (1780–1842). For most of the 18th century the church was known as the Long Lane Meeting-House. In 1788, state leaders met in the relatively spacious building to determine Massachusetts' ratification of the United States Constitution. Thereafter the church renamed itself the Federal Street Church in honor of the event. In 1803, it called Channing as its minister who defined "Unitarian Christianity" and launched the Unitarian movement, making the Federal Street Church one of the first to define itself as Unitarian.