Seth C. Brace

Brace, Seth Collins, son of the Rev. Joab Brace, was born at Newington, Connecticut, Aug. 3, 1811, and entered the Presbyterian ministry in 1842, but subsequently joined the Congregationalists. His Temperance hymn, “Mourn for the thousands slain," is widely used. It was written in 1843, and included in the Philadelphia Parish Hymn, 1843, with others which he wrote on the same subject, under the signature of "C."

--John Julian, Dictionary of Hymnology, Appendix, Part II (1907)