Using the concept of "Badboy" (e.g. Uses force to attack and conquer other nations thereby breaking the prior balance of powers, and is the aggressor) drawn by Paradox Interactive for its games, who would have most badboy per century
21th Century- U.S.A./President George W. Bush of the United States of America
20th Century- Germany/Führer Adolf Hitler of Germany
19th Century- Empire of France/Emperor Napoleon I Bonaparte of France
18th Century- Mughal Empire/Emperor Ekaterina (Catherine) II of Russia
17th Century- Ottoman Empire/King Louis XIV of France
16th Century- Spain-Iberian Union/King Filipe (Phillip) II of Spain
15th Century- Ottoman Empire/Sultan-Caliph Mehmed II of the Ottoman Empire
14th Century- Timurid Empire/Emir Timur Lang (Tamerlane) of the Timurid Empire
13th Century- Mongol Empire/Emperor Genghis Khan of the Mongol Empire
12th Century- Ayyubid Sultanate/Sultan Salah ad-din (Saladin) of the Ayyubid Sultanate
11th Century- Byzantine Empire/Emperor Heinrich (Henry) III of the Holy Roman Empire
10th Century- Holy Roman Empire/Emperor Otto I of the Holy Roman Empire
9th Century- Holy Roman Empire/Emperor Charles Magne of the Frankish Kingdom-Holy Roman Empire
8th Century- Arab Muslim Caliphate/Duke Charles Martel of the Frankish Duchy
7th Century- Arab Muslim Caliphate/Caliph Uthman Ibn Affan of the Arab Muslim Caliphate (Rashidun Dynasty)
6th Century- Byzantine Empire/Emperor Iustinianus (Justinian) I of the Byzantine Empire
5th Century- Visigothic Kingdom/Emperor Attila I of the Hunnic Empire
4th Century- Hunnic Empire/Emperor Balamber of the Hunnic Empire
3rd Century- Persian Sassanid Empire/King-Emperor Shapur I of the Persian Sassanid Empire
2nd Century- Kushan Empire/King Vima Kadphises of the Kushan Empire
1st Century- Roman Empire/Emperor Traianus (Trajan) of the Roman Empire
Year 0
1st Century- Roman Republic/Consul Iulius (Julius) Caesar of the Roman Republic
2nd Century- Roman Republic/Emperor Wu of the Han Empire
3rd Century- Mauryan Empire/Emperor Shi Huang of the Qin Empire
4th Century- Macedonian Empire/King-Emperor Alexandros (Alexander) III of the Macedonian Empire
5th Century- Athenian Democracy/Emperor Xerxes I of the Persian Achaemenid Empire
That is all. I'm open to modifications, especially for the Ancient and Medieval Periods.
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