Question: Melville D. Landon travelled to Russia with which Kentucky politician known as the "Lion of White Hall"?

Context paragraphs:
White Hall, West Virginia: White Hall is a town in Marion County, West Virginia, United States.  The population was 648 at the 2010 census.  White Hall became incorporated in 1989.  White Hall is right beside Fairmont and has many different stores and restaurants.

White Hall (Toano, Virginia): White Hall (also known as Whitehall Tavern and White Hall Farm) is a house and former tavern located in Toano, Virginia.  It was built in 1805 by William Geddy and is still owned and maintained by the original family.  It is listed on the United States National Register of Historic Places.

White Hall Historic District: The White Hall Historic District is a 11 acre historic district in White Hall, Illinois.  The district, which includes two blocks of Main Street and roughly one block of Jacksonville Avenue, encompasses White Hall's historic commercial district.  Most buildings in the district are brick structures built in the 1870s, White Hall's main period of commercial development; however, some date from the early 20th century as well.  Some of the early buildings in the district include the White Hall Foundry, which produced cast iron pieces for several other buildings; the Grange Block and the White Hall National Bank, two bank buildings with complementary styling; the Dawdy Building, the only surviving wood-frame structure in the district; and several Italianate buildings, such as the Union Hall, the Masonic Hall, and the Brantzel's Building.  Significant 20th-century additions to the district include Whiteside Park, home to a sculpture created by Lorado Taft; the White-Griswold Memorial Library, the city's public library; the Vitagraph Theater, which features a decorative terra cotta facade; and the Prairie School Chapin Building.

Cassius Marcellus Clay (politician): Cassius Marcellus Clay ( ; October 19, 1810 – July 22, 1903), nicknamed the "Lion of White Hall", was a Kentucky planter, politician, and emancipationist who worked for the abolition of slavery.  He freed the slaves that were handed down as his inheritance from his father.  Those freed slaves were allowed to stay and were paid a wage.  He was appointed by President Abraham Lincoln as the United States minister to Russia during the American Civil War, and is credited with gaining Russian support for the Union.

White Hall Plantation House Ruins and Oak Avenue: White Hall Plantation House Ruins and Oak Avenue is a historic plantation site located near Ridgeland, Jasper County, South Carolina.  The site consists of the ruins of a brick house with tabby wings and twin tabby flanking outbuildings; a tabby retaining wall; and a massive double avenue of oaks planted in the late-18th or early-19th century.  The plantation house was built between 1771 and 1776, then enlarged between 1786 and 1791.  The house at White Hall burned about 1870 and was not renovated or occupied afterward.

White Hall Foundry: The White Hall Foundry is a historic iron foundry located at 102 S. Jacksonville St. in White Hall, Illinois.  The foundry was built in 1877 for brothers George W. and Richard B. Winn.  It produced cast iron for new buildings in White Hall, making it an important part of the city's economy during a building boom in the late 19th century.  The building is a small brick structure with particularly well-crafted details for an industrial building, such as its cornice and fanlights.  The internal truss system supporting the building's roof is an example of an inverted Kingpost truss; it is one of the few well-preserved examples of such a truss in Illinois.

Melville D. Landon: Melville De Lancey Landon (1839–1910), also known by his pen name Eli Perkins, was an American humorist, lecturer, and journalist.  Landon was born in Eaton, New York, in 1839, the son of John and Nancy Marsh Landon.  He attended Madison University (now Colgate University) for one year, and graduated from Union College in 1861.  After graduation, he obtained a position in the United States Treasury, and served in the Civil War under General Augustus Louis Chetlain.  He left the army in 1864, and became a cotton planter in Louisiana and Arkansas.  In 1867 he traveled abroad in Russia as secretary to Cassius M. Clay, Minister to Russia.  He returned to the United States in 1870, and the following year published his first book, "The Franco-Prussian War in a Nutshell".  He wrote and compiled several books of humor, and was past president of the New York News Association.  He died at his home in Yonkers, New York on December 16, 1910 at the age of 71, after suffering from locomotor ataxia for some six years.

White Hall High School: White Hall High School is a public high school which serves students in grades nine through twelve and located in White Hall, Jefferson County, Arkansas.  White Hall is the only high school in the White Hall School District.

White Hall Plantation House: White Hall Plantation House is an 1840s Italianate and Greek Revival plantation house attributed to the architect Henry Howard and built in 1848-49 by Elias Norwood.  It is located in Legonier, a hamlet on the east bank of the Atchafalaya River, today part of the unincorporated town of Lettsworth, Louisiana.  White Hall's most notable owner was Bennet Barton Simmes (1811–1888), founder of Simmesport, state senator, and contributor to the Louisiana Articles of Secession prior to the Civil War.  He is also said to have been a steamboat captain and Confederate general.  The home is listed on the National Register of Historic Places.

Buildings of Jesus College, Oxford: The main buildings of Jesus College, one of the colleges of the University of Oxford, are located in the centre of the city of Oxford, England, between Turl Street, Ship Street, Cornmarket Street, and Market Street.  Jesus College was founded in 1571 by Elizabeth I upon the petition of a Welsh clergyman, Hugh Price, who was treasurer of St David's Cathedral.  Her foundation charter gave to the college the land and buildings of White Hall, a university hall that had experienced a decline in student numbers.  Price added new buildings to those of White Hall, and construction work continued after his death in 1574.  The first of the college's quadrangles, which includes the hall, chapel, and principal's lodgings was completed between 1621 and 1630.  Construction of the second quadrangle began in the 1630s, but was interrupted by the English Civil War and was not completed until about 1712.  Further buildings were erected in a third quadrangle during the 20th century, including science laboratories (now closed), a library for undergraduates, and additional accommodation for students and fellows.  In addition to the main site, the college owns flats in east and north Oxford, and a sports ground.

Supporting paragraphs: Melville D. Landon Cassius Marcellus Clay (politician)
Answer: Cassius Marcellus Clay