Ferdinand I

Louis II married Mary of Austria and Ferdinand I married Anna of Bohemia and Hungary on 22 July 1515.

Suleiman musters an army in Bulgaria and launches the invasion of Hungary on 10 May 1529.

Suleiman besieges Vienna from 27 September to 15 October 1529, but the city successfully defends itself.

Ferdinand I occupied the castle of Esztergom in 1530.

Ferdinand I signed the treaty in Constantinople, acknowledging Ottoman suzerainty and agreeing to pay tribute.

Ferdinand I proclaimed the union of Sicily and Naples into the Kingdom of the Two Sicilies on 12 December 1816, abolishing the Sicilian constitution.

General Pepe led a military revolt in Naples, compelling King Ferdinand to sign a constitution modeled on the Spanish Constitution of 1812.

Neapolitan forces under General Pepe were defeated at Rieti on 7 March 1821, failing to defend the Abruzzi defiles.

Austrian forces under Frimont entered Naples by 24 March 1821, restoring Ferdinand's authority.

Austrian forces defeated Neapolitan rebels at Rieti on 7 March 1821, marking the first engagement of the intervention.

Austrian forces entered Naples on 24 March 1821, restoring Ferdinand I to the throne.

Francis I died in Vienna on 2 March 1835 at age 67, ending his reign as the first Emperor of Austria.

Ferdinand I succeeded his father Francis I as Emperor of Austria on 2 March 1835.

Metternich faced internal opposition, losing allies and being forced to share power, leading to government paralysis.

The Revolutions of 1848 forced Metternich's resignation, ending his tenure as chancellor and his three decades at the center of the Concert of Europe.

Ferdinand I abdicated on 2 December 1848, ending his reign. The abdication was part of a political plan to address the Hungarian Revolution.

Dimitar Grekov was appointed Prime Minister of Bulgaria on 30 January 1899 by King Ferdinand I.

Grekov was removed from office on 13 October 1899 after a brief tenure.