Although the documentation with these materials state that the author of this diary was the father of Mary Todd, Robert Smith Todd was not born until 1791. With that in mind it seems likely that this is the diary of Brigadier General Robert Todd who was born April 19, 1754 in Montgomery County, Pennsylvania. He came to Kentucky in 1776 and was known as an 18th century American pioneer, politician and soldier. Robert Todd is credited as being one of the founders of Lexington, Kentucky. His brothers were John and Levi Todd who also settled in Lexington. If my poor genealogy is correct, Robert Todd would be the Great Uncle of Mary Todd.
On Friday June 18th Todd wrote, "Started and continued down said branch of Big Barran which I suppose to be the principal. Killed large buffalo. Turned into raining. Encamped and barbecued some of the meat. This part of the country is well watered with excellent springs - traveled about four miles." So goes part of the diary kept by Robert Todd of his expedition for settling lands.