Prosser family. Prosser Family Papers, 1863-1974. 1 Letter. Location: MISC:P. Born in Mississippi, William and Ralph Hylton Prosser were the sons of Daniel Launcelot Hylton Prosser and Sarah Eleonor Lewis. Ralph and William served in the Confederate Army during the Civil War. The family papers contain a letter, two newspaper clippings, and an obituary. William Hylton Prosser wrote the letter to his sister during his time as a Confederate soldier in the Civil War. The obituary is for Reverend Ralph Hylton Prosser. One newspaper clipping is a letter written by Dorothy Prosser Sims and both newspaper clippings discuss a Civil War monument in Innis, Louisiana. Mss. 5140.