Mr. Banneker, who is he really? I think mathematical genius is the most accurate summary of his well of knowledge. Most notably he is revered for a clock, an almanac and a city once known as “Chocolate City”. Read more about him for yourself and watch the video below for more information the city on the Potomac.

http://www.pbs.org/wgbh/aia/part2/2p84.html
https://www.bnl.gov/bera/activities/globe/banneker.htm
http://www.black-inventor.com/Benjamin-Banneker.asp