John Tyler (b. 1790 - d. 1862) was President from 1841-1845 after assuming the role upon the death of William Henry Harrison. Not considered one of the better presidents in history, he was still among the short list of Americans who have held that title. He also fathered 15 children in his life, which helped his line extend as far as it has.
I mailed to Harrison Tyler on October 16 and got the card back on January 15, for a 91-day TAT.