In the 1860s, John D. Rockefeller started his oil empire in Cleveland, Ohio. By his death in the 1930s, he’d built the largest fortune in American history by building a monopoly in the oil industry. But now, his living descendants are fighting Exxon Mobil, the largest remnant of Rockefeller’s Standard Oil, over what they call decades of deception by the company. Today, E&E News reporter Maxine Joselow explains the battle between the two sides of Rockefeller’s legacy. Maxine Joselow covers climate change and law for E&E News. Carlos Prieto is a Politico podcast producer. Jenny Ament is the senior producer of POLITICO audio. Irene Noguchi is the executive producer of POLITICO audio.