
Last King of Hungary, beatified by Catholic Church.
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Charles IV was crowned King of Hungary in Budapest, succeeding his great-uncle Franz Joseph I. His coronation took place during World War I, and he inherited a monarchy strained by war and nationalist tensions. He was the last Habsburg to be crowned King of Hungary.
Charles IV secretly attempted to negotiate a separate peace with the Allies through his brother-in-law, Prince Sixtus of Bourbon-Parma. The Sixtus Affair failed when the negotiations were revealed, angering Germany and weakening Austria-Hungary's position.
Following the collapse of Austria-Hungary at the end of World War I, Charles IV issued a proclamation renouncing participation in state affairs but did not formally abdicate. He went into exile in Switzerland, and the Austrian Republic was proclaimed.
Charles IV made two attempts to regain the Hungarian throne, traveling to Hungary in March and October 1921. Both attempts failed due to opposition from the Entente powers and the Hungarian regent Miklos Horthy. After the second attempt, he was exiled to Madeira.
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