Erba-Odescalchi, or Odescalchi-Erba is the name of a Roman aristocratic family. They are supposed to be descended from Enrico Erba, imperial vicar in Milan in 1165. Alessandro Erba married Lucrezia Odescalchi, sister of Pope Innocent XI, in 1709, who is believed to have been descended from Giorgio Odescalchi (Jioruit at Como in 1290). The title of prince of the Holy Roman Empire was conferred on Alessandro in 1714, and that of duke of Syrmium in Hungary in 1714, with the qualification of serene… (More on Odescalchi)