Maybe Dimon fatally damaged his relationship with Weill by not promoting Weill's daughter, a decision that led to her departure from Travelers. He sold Bank One to JPMorgan (JPM ), returned to Manhattan, and this January took over as chief executive of JPMorgan Chase & Co. (JPM ) Now he hopes to refine the strategy he and Weill designed for Citigroup and one day take on the company they created. Thus a new rivalry is born: Dimon vs. Charles O. Prince III, the man Weill, who retired in April, ...

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