 English Presbyterians were attracted to the second city at Norwich, by its emerging scientific community, which in the wake of the Enlightenment was particularly strong in Scotland.They began to become a formal denomination in 1774 when Theophilus Lindsey organized meetings with Joseph Priestley, founding the first avowedly Unitarian congregation in the country, at Essex Street Church in London.In 1791 Lindsey and his colleague John Disney were behind the "first organized denominational Unitarian society", formally The Unitarian Society for promoting Christian Knowledge and the Practice of Virtue by the Distribution of Books but more simply known as the Unitarian Book Society.