Ferdinand I of Bulgaria vs Hamengkubuwono IX

Ferdinand I proclaimed Bulgaria's full independence from the Ottoman Empire, declaring himself Tsar. This ended Ottoman suzerainty and established Bulgaria as a sovereign kingdom.

Ferdinand I led Bulgaria into the First Balkan War against the Ottoman Empire. Bulgaria achieved major victories, capturing Adrianople and much of Thrace, significantly expanding its territory.

Ferdinand I ordered an attack on former allies Serbia and Greece, triggering the Second Balkan War. Bulgaria was defeated by a coalition including Romania and the Ottoman Empire, losing most of its gains.

After Bulgaria's defeat in World War I, Ferdinand I abdicated in favor of his son Boris III. He went into exile, ending his reign amid national crisis and territorial losses.

Hamengkubuwono IX became the Sultan of Yogyakarta, a princely state in the Dutch East Indies. His reign began during the Japanese occupation, and he later played a key role in the Indonesian National Revolution.

Hamengkubuwono IX declared his support for the newly proclaimed Republic of Indonesia, offering Yogyakarta as the republic's capital. His decision provided a safe haven for the republican government during the war for independence.

Hamengkubuwono IX, along with other senior military figures, was involved in the transfer of executive authority from President Sukarno to General Suharto via the Supersemar document. This event marked the beginning of Suharto's New Order regime.

Hamengkubuwono IX was elected Vice President of Indonesia under President Suharto, serving until 1978. His role symbolized the integration of traditional Javanese monarchy into the modern Indonesian state.

Hamengkubuwono IX died in Jakarta and was given a state funeral. He was buried in the royal cemetery at Imogiri, Yogyakarta. His death marked the end of an era for the Yogyakarta Sultanate and Indonesian politics.