Born in Winchester, Tennessee into a family of Welsh origin, he moved with his parents to Alabama about 1818.
Davis "became one of the most successful criminal lawyers in the South",[1] and was elected prosecuting attorney for the sixth judicial district 1835–1839.
He was then appointed by Governor Tilghman Tucker as a judge of the high court of appeals in 1842,[1] but after four months' service resigned.
He was elected as a Democrat to the Thirty-fifth and Thirty-sixth Congresses and served from March 4, 1857, to January 12, 1861, when he withdrew.
[1] He died suddenly,[1] while in Huntsville, Alabama in 1890 and was buried at the Odd Fellows Cemetery in Aberdeen.