On July 7, 1922, Edmund B. Stewart, son of the early Montgomery settler Charles B. Stewart, claimed in a letter that his father had drafted the original design of the Lone Star Flag enclosing what he claimed was his father's draft of the flag's design. To date, this letter and draft copy, along with claims by Stewart's descendants, remain the only evidence currently known that Charles Stewart was the designer of the flag. In particular, the lack of evidence not directly tied to the Stewart family has caused many flag historians to question Stewart's claim.
As a legacy of the Stewart claim, one of the nicknames for the city of Montgomery is "Birthplace of the Texas Flag."