Ivan the Terrible

Ivan IV Vasilyevich (Russian: Ива́н Васи́льевич, tr. Ivan Vasilevich; 3 September [O.S. 25 August] 1530 – 28 March [O.S. 18 March] 1584), commonly known as Ivan the Terrible (Russian:  Ива́н Гро́зный​ , Ivan Grozny), was the Grand Prince of Moscow from 1533 to 1547 and 'Tsar of All the Russias' from 1547 until his death in 1584.

His long reign saw the conquest of the Khanate of Kazan, Khanate of Astrakhan and Khanate of Sibir, transforming Russia into a multiethnic and multicontinental state spanning almost one billion acres, approximately 4,046,856 km² (1,562,500 sq mi). Ivan managed countless changes in the progression from a medieval state to an empire and emerging regional power, and became the first ruler to be crowned as Tsar of All the Russias.

Historic sources present disparate accounts of Ivan's complex personality: he was described as intelligent and devout, yet given to rages and prone to episodic outbreaks of mental illness, that increased with his age, affecting his reign. In one such outburst, he killed his groomed and chosen heir Ivan Ivanovich. This left the Tsardom to be passed to Ivan's younger son, the weak and intellectually disabled Feodor Ivanovich.

Alexander the Great

Alexander III of Macedon (20/21 July 356 BC – 10/11 June 323 BC), commonly known as Alexander the Great (Greek: Ἀλέξανδρος ὁ Μέγας, Aléxandros ho Mégas [a.lék.san.dros ho mé.gas], from the Greek ἀλέξω (alexō) "defend" and ἀνδρ- (andr-), the stem of ἀνήρ (anēr) "man" and means "protector of men"), was a King (Basileus) of the Ancient Greek kingdom of Macedon and a member of the Argead dynasty, an ancient Greek royal house. Born in Pella in 356 BC, Alexander succeeded his father, Philip II, to the throne at the age of twenty. He spent most of his ruling years on an unprecedented military campaign through Asia and northeast Africa, and by the age of thirty he had created one of the largest empires of the ancient world, stretching from Greece to Egypt into northwest India and modern-day Pakistan. He was undefeated in battle and is widely considered one of history's most successful military commanders.

During his youth, Alexander was tutored by the philosopher Aristotle until the age of 16. After Philip's assassination in 336 BC, Alexander succeeded his father to the throne and inherited a strong kingdom and an experienced army. Alexander was awarded the generalship of Greece and used this authority to launch his father's Panhellenic project to lead the Greeks in the conquest of Persia. In 334 BC, he invaded the Achaemenid Empire, ruled Asia Minor, and began a series of campaigns that lasted ten years. Alexander broke the power of Persia in a series of decisive battles, most notably the battles of Issus and Gaugamela. He subsequently overthrew the Persian King Darius III and conquered the Achaemenid Empire in its entirety. At that point, his empire stretched from the Adriatic Sea to the Indus River.