Theodore Roosevelt delivered the speech entitled “Citizenship in a Republic” at the Sorbonne in Paris on April 23, 1910. The speech is popularly known as “The Man in the Arena.” His statements at the Sorbonne were part of a larger trip to Europe that also included visits to Vienna, Budapest, and Oslo. On May 5, 1910 he gave his Nobel Prize speech. This trip came in the midst of Roosevelt's frustration with the Taft administration and followed his African safari with Kermit. After completing his tour of Europe, Roosevelt would make a triumphant return to the U.S.

Source: https://www.theodorerooseveltcenter.org/Learn-About-TR/TR-Encyclopedia/Culture-and-Society/Man-in-the-Arena.aspx#top