Cassius Marcellus Clay (1810–1903)

State of Residence: Kentucky
  1. Envoy Extraordinary and Minister Plenipotentiary (Russia)
    Appointed: March 28, 1861
    Presentation of Credentials: July 14, 1861
    Termination of Mission: Presented recall on June 25, 1862
  2. Envoy Extraordinary and Minister Plenipotentiary (Spain)
    Appointed: April 14, 1861
    • Declined appointment.
  3. Envoy Extraordinary and Minister Plenipotentiary (Russia)
    Appointed: March 11, 1863
    Presentation of Credentials: May 7, 1863
    Termination of Mission: Relinquished charge October 1, 1869