Conversation so far:
Why did Columbus Delano resign?
In 1875, Columbus Delano's reputation for personal honesty came under increasing scrutiny as revelations of corruption in the Grant administration continued to be the subject of investigations and media revelations.
Who was Columbus Delano?
Columbus Delano was a lawyer, rancher, banker, statesman and a member of the prominent Delano family.
In what year did Columbus Delano resign?
Ulysses Grant requested Columbus Delano's resignation in 1875; he left office with damage to his reputation for personal honesty.

Question: who is grant?
Self-contained rewrite: Who is Ulysses S Grant?