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The Diadochi was a group of generals who fought for Alexander the Great. When Alexander died, he left no heir, so the generals became Alexander's successors. The word Diadochi means "successors." The generals waged wars against each other to decide who would control their conquered territory under Alexander. Eventually, each general who survived the wars had their states and territories. The borders of the territories they controlled changed as they conquered land from each other.
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The Diadochi began the Hellenistic Period, spreading Greek philosophy, religion, art, and culture to the lands they controlled. It is the reason the New Testament was written in Greek. Each of the Diadochi had a dynasty to which they left their kingdoms. Eventually, the Romans took control of much of these lands, including Greece. The final battle with the last heir of the Diadochi was the Battle of Actium, when Caesar Augustus's navy defeated Cleopatra's navy. Cleopatra was the last heir of Ptolemy I Soter.
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Seleucus I Nicator
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Seleucus I Nicator, or "Seleucus the Victorius" (lived 358—281 BC, reigned 305—281 BC), initially took control of the Mesopotamian regions of Babylonia and Syria in 321 BC. He went on to conquer Near Eastern territories that are today's Iraq, Iran, Afghanistan, Syria, and Lebanon. At his empire's height, it also included Anatolia, Persia, the Levant, and today's now Kuwait and Afghanistan.
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Antigonus I Monophthalmus
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Or Antigonus the one-eyed (382--301 BC, reigned 306--301 BC) initially received Pamphylia and Lycia on the south Mediterranean coast of Asia Minor (today's Türkiye). At one point during the wars of the Diadochi, he was the most powerful, controlling Greece, Asia Minor, Syria, Phoenicia, and northern Mesopotamia. He died at the Battle...