How was Giuliano della Rovere related to Pope Sixtus IV?

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Medallion depicting Pope Julius II — Julius II Julius II, contemporary medallion; in the coin collection of the Vatican Library.

Giuliano della Rovere, who later became Pope Julius II, was the nephew of Pope Sixtus IV. He was the son of Rafaello della Rovere, who was the only brother of Sixtus IV.1