La Salle county Illinois directory of 1877 on page 514 for Manlius Township.
St.Clair Gum; Wagon Maker; Marseilles; born in Rockingham county County Virginia Sept 24th 1826; came to this county in 1855; Republican; Independent,married in 1855 to Julia E Reniff of Grundy county she was born in Massachusetts in 1831; have 3 sons and 2 daughters; has held several important township offices; a wagon maker for 12 years and a real estate agent for 6 years.
1870 census for Marseilles,Illinois
St.Clair Gum age 48 Real Estate Agent,born in Virginia
wife Julia age 38 born in Massachusetts.
son John Gum 12, son Wills 10 and daughter Edith 5. Living with them Samantha Ritchie age 28. (Note that the name of Samantha is not clear and could be Lumantha; also the relationship is not stated).
Illinois State Archives:
Saint Clair Gum to Julia E Reniff January 4th 1855 in Grundy county Illinois, number of marriage cert is 00000362