Inauguration of Andrew Johnson
The inauguration of Andrew Johnson as the 17th president of the United States was held on April 15, 1865, on the third floor of Kirkwood House in Washington, D.C., following the assassination of President Abraham Lincoln. The inauguration marked the commencement of Andrew Johnson's only term (a partial term of 3 years, 323 days) as president.
Source: Wikipedia — Inauguration of Andrew Johnson (CC BY-SA 4.0)