The Presidents of the United States.
We tend to overlook the Presidents who were sandwiched in between the Revolutionary/Constitutional era and the Civil War. In fact, between Jackson and Lincoln, there were eight Presidents in 25 years (1836-1861) who served one term or less. They were: Van Buren, Harrison, Tyler, Polk, Taylor, Fillmore, Pierce, Buchanan. Most are forgotten now. Among these eight, only James K. Polk could be considered a "strong President".
I'm taking some time to read up on these men, and the time and the nation that they lived in. I'll post more soon.