1. Vermont Ratifies the U.S. Constitution
May 12, 1791, is a significant day in Vermont history, as it was the day that the state ratified the U.S. Constitution, becoming the 14th state to do so.

2. Ethan Allen's Capture
On May 12, 1775, Ethan Allen and the Green Mountain Boys captured Fort Ticonderoga from the British during the American Revolution. This was a significant victory for the American forces, as they gained valuable artillery and supplies.

3. Vermont Becomes the First State to Prohibit Slavery in its Constitution
On May 12, 1777, Vermont became the first state to abolish slavery in its constitution. Although the law was not fully enforced until 1790, this was a significant step towards ending slavery in the United States.

4. The Birth of Lyman E. Knapp
Lyman E. Knapp, a prominent lawyer and politician in Vermont, was born on May 12, 1837. Knapp served as a member of the U.S. House of Representatives and was appointed as a federal judge in 1877.

5. The Vermont Department of Motor Vehicles is Established
On May 12, 1908, the Vermont Department of Motor Vehicles was established, making Vermont one of the first states to create a centralized agency for motor vehicle regulation. Today, the department oversees driver licensing, vehicle registration, and other related services in the state.