Zephaniah Platt was an American lawyer and politician from Michigan.
Background
He was the son of New York Supreme Court Justice Jonas Platt and Helena (Livingston) Platt (1767-1859), and was baptized at the Presbyterian Church in Pleasant Valley, New York On September 30, 1818, he married Cornelia Jenkins (d 1890), and they had seven children.
Career
He was Michigan Attorney General from 1841 to 1843. He removed to the Michigan Territory and practiced law at Jackson, Michigan. He was Attorney General of the State of Michigan from 1841 to 1843.
He attended the 1842 Ojibwe treaty negotiations with the "Lake Superior Chippewa" at LaPointe and signed the treaty as a witness.
Subsequently Platt acted as representative for some of the American Fur Company"s Ojibwe traders seeking recompense for past Indian debts. After the end of the American Civil War, he removed to South Carolina, and was Judge of the 2nd Circuit Court from 1868 until his death.