The Sixtus Affair (German: Sixtus-Affäre, Hungarian: Sixtus-ügy) was a failed attempt by Emperor Charles I of Austria to conclude a negotiated peace with the allies in World War I. The affair was named after his brother-in-law and intermediary, Prince Sixtus of Bourbon-Parma.[1]
- ^ Marchling, "The Sixtus Affair" (1973)