The Ultimate Keyhand Quest: You're going on a quest to save a person who is being punished for standing up for the truth. What time period are you traveling to? Who are you trying to save? What are you taking with you?
I would travel back to 1633 and rescue Galileo from the Inquisition.
He was accused of heresy due to his support of the Copernican theory that the sun is the center of the universe.
He formally abjured his statements and was placed under house arrest for the remainder of his life. It is a popular story that after he recanted his belief in the Copernican system and the earth revolving around the sun, he said to himself, "And yet it moves."
During that time there was danger from the plague, so I would want a hazmat suit to take with me on my quest.
I'd probably also take a laptop or iPad with NASA photos of the solar system. He would definitely want to come back with me to Petrarch's Library when he saw that his ideas had led to such wonderful scientific discoveries.