Karl I of Austria vs Reza Shah Pahlavi

Karl I became Emperor of Austria and King of Hungary upon the death of his great-uncle Franz Joseph I. He inherited an empire exhausted by World War I and facing internal disintegration.

Karl I secretly initiated peace negotiations with France through his brother-in-law Prince Sixtus of Bourbon-Parma. He proposed supporting French claims to Alsace-Lorraine in exchange for a separate peace, but the effort failed when Germany vetoed the terms.

As World War I ended, nationalist movements declared independence across the empire. Karl I issued a proclamation transforming Austria into a federal state, but it was too late; the empire dissolved into separate republics.

Karl I renounced participation in state affairs but did not formally abdicate. He was forced into exile in Switzerland, and the Austrian parliament formally deposed the Habsburg dynasty, ending over 600 years of rule.

Karl I twice attempted to regain the Hungarian throne, traveling to Hungary in March and October 1921. Both efforts failed due to opposition from the Entente powers and the Hungarian regent Mikl

Reza Khan, a Cossack Brigade officer, led a coup that overthrew the Qajar government. He became Minister of War and later Prime Minister, using the military to consolidate power and suppress regional rebellions.

Reza Khan crowned himself Reza Shah Pahlavi, founding the Pahlavi dynasty. He replaced the Qajar dynasty and began a program of rapid modernization, centralization, and secularization of Iran.

Reza Shah oversaw the completion of the Trans-Iranian Railway, connecting the Caspian Sea to the Persian Gulf. The project was a major infrastructure achievement, facilitating trade and military transport, but was built with forced labor.

Britain and the Soviet Union invaded Iran to secure oil fields and supply routes. Reza Shah refused to expel German nationals, leading to his forced abdication in favor of his son Mohammad Reza Pahlavi. He was exiled to South Africa.