Montgomery Blair

Montgomery Blair (May 10, 1813 – July 27, 1883) was an American politician and lawyer from Maryland. He served in the Lincoln administration cabinet as Postmaster-General from 1861 to 1864, during the Civil War. He was the son of Francis Preston Blair, elder brother of Francis Preston Blair, Jr. and cousin of B. Gratz Brown.
https://en.wikipedia.org/wiki/Montgomery_Blair