William Davis

William Davis is potentially the father of James Davis. Mary Palmquist, a member of ancestry.com, writes the following via email on April 27, 2015:

My husband corresponded with Charles C. Davis Jr. in 1985. Charles was the son of Charles C. Davis who was the son of Henry Clay Davis. 
Charles wrote the following in his letter to my husband "My notes indicate that William Davis was the father of James Davis who was born
in 1805 and married Euphemia Wilson. William Davis (Welch) was a friend of Thomas Jefferson "who Jefferson persuaded him (Davis) to 
move a foundry firm from Philadelphia to Washington, D.C. This foundry firm (owned by William Davis) built the first iron railing around 
the White House and other buildings. He later built the first bridge (iron) across the Potomac River. When almost finished a flash flood 
wiped out the bridge and William Davis (financially). He died shortly thereafter." I have been searching for a William Davis making a 
guess as to a possible birthdate but so far have been unsuccessful.