- Birth*: Robert Clarke was born on 18 January 1824 at Wheat Sheaf, Essex County, New Jersey.
- Marriage*: Robert Clarke married Ellen Seiple, daughter of Jacob John Seiple and Elizabeth Scheib, on 8 March 1846 at Elizabeth, Union County, New Jersey.
- Death*: Robert Clarke died on 14 July 1896 at Henry, Marshall County, Illinois, at age 72.
Family: Ellen Seiple b. 24 Jul 1823, d. 16 May 1865