David Martyn Lloyd-Jones (December 20, 1899 – March 1, 1981) was a Protestant Christian who headed much of the evangelical movement of the 20th century. He stood firm against what he saw as false liberal doctrines that had become a part of the Christian denominations of Wales and England. He believed strongly that reformed evangelical Christians ought to leave the old denominations as a protest against what he percieved to be the increasing adoption of loose, un-biblical doctrines by mainstream churches.