Alson Sherman was the 8th Mayor of Chicago born 1811 he was preceded by Augustus Garrett who was born in 1801 and was married to Aurora Abbott.
(1811-04-21)April 21, 1811
Barre, Vermont Augustus Garrett Aurora Abbott Augustus Garrett (1801  November 30, 1848) was an American politician who twice served as Mayor of Chicago (18431844, 18451846). 
