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Hernando de Soto (c. 1500 – 1542) was a Spanish explorer and conquistador who was involved in expeditions in Nicaragua and the Yucatán Peninsula. He played an important role in Francisco Pizarro's conquest of the Inca Empire in present-day Peru, but is best known for leading the first European expedition deep into the territory of the modern-day United States. He was the first European documented as having crossed the Mississippi River, which he did on May 8, 1541, depicted in this engraved vignette, an example of art on United States banknotes. Produced for the Department of the Treasury's Bureau of Engraving and Printing, the engraving is of William Henry Powell's painting Discovery of the Mississippi by De Soto, which hangs in the Capitol rotunda in Washington, D.C.Engraving credit: Frederick Girsch, after William Henry Powell; restored by Andrew Shiva