1. Birth of Mary Todd Lincoln: June 26 marks the birthdate of Mary Todd Lincoln, who was born in Lexington, Kentucky in 1818. She married President Abraham Lincoln and served as First Lady during his presidency.

2. Kentucky ratifies the Constitution: On June 26, 1790, Kentucky became the fifteenth state to ratify the United States Constitution, making it an official part of the country and paving the way for future states to join.

3. Founding of Kentucky State University: On June 26, 1886, Kentucky State University was founded in Frankfort, Kentucky as a land-grant institution for African American students. It is currently the only public historically black university in the state.

4. Battle of Barbourville: On June 26, 1861, the Battle of Barbourville took place in Knox County, Kentucky during the Civil War. This was one of the earliest engagements of the war in the state and ended in a Union victory.

5. Muhammad Ali's final fight: On June 26, 1976, Muhammad Ali fought his final professional boxing match against Ken Norton at Yankee Stadium in New York City. Ali won by a unanimous decision, ending his career with a record of 56 wins and 5 losses. Although Ali was born in Louisville, Kentucky, this event is not directly related to Kentucky history.