On November 6, 1860, Abraham Lincoln was elected 16th president of the United States. He served from March 1861 to April 1865, when he was assassinated. He is thought to be one of the most remarkable and esteemed figures in all of American history.
Lincoln seems like a person who may have practiced mindfulness due to his open mindedness. Here are some mindfulness exercises.
https://at250.org/2022/01/31/simple-mindfulness-practices-you-can-use-anywhere/