The Plymouth Brethren are a conservative, low church, evangelical movement, whose history can be traced to Dublin, Ireland, in the late 1820s, originating from Anglicanism. Among other beliefs, the group emphasizes sola scriptura. Brethren generally see themselves not as a denomination, but as a network, or even as a collection of overlapping networks, of like-minded independent churches. Although the group refused for many years to take any denominational name to itself—a stance that some of them still maintain—the title The Brethren, is one that many of their number are comfortable with in that the Bible designates all believers as brethren.
Is there an answer to this question (If it cannot be answered, say "unanswerable"): When did the Plymouth Brethren originate?
late 1820s