The Ancient civilization of Babylon existed in the modern-day state of Iraq. Although you might not have known this immediately, you should know that Babylon was a Mesopotamian kingdom and that Iraq is the only modern country on this list which falls in the region of Mesopotamia. 

The Sack of Babylon occurred in approximately 1530 BCE, when the Hittite ruler, Mursili I, marched his army into the heart of Mesopotamia and lay waste to Babylon. It brought about the demise of the Amorite Dynasty of Hammurabi and ushered in a new era of civilizations in the Mesopotamian region.

"Akkadian" is the name of a language group, cultural group, and civilization that predates the Babylonian Empire. The Babylonian Empire arose in the Fertile Crescent of land between the Tigris and Euphrates Rivers. Its main rival to the North was another Akkadian civilization known as the Assyrian Empire. The two fought for centuries for control over the Fertile Crescent and each reigned as hegemonic powers for a period of time.

Cyrus the Great was the founded of the Achaemenid Empire, the progenitor of the Persian Empire. Justinian I is the most famous ruler of the Byzantine Empire. Hammurabi was the most influential ruler of the old Babylonian Empire that reached it's apex almost four thousand years ago. Nebopolassar was an early ruler of the Neo-Babylonian Empire. But, it was during the reign of Nebuchadnezzar II (605-561 B.C.E.) that the Neo-Babylonian Empire reached the height of it's powers. It is useful at this juncture to draw a distinction between the old Babylonian Empire of Hammurabi (circa eighteenth century B.C.E.) and the Neo-Babylonian Empire of Nebuchadnezzar II (more than a millennium later).

Cyrus the Great is the founder of the great Achaemenid Empire of the ancient and classical Near East (later called the Persian Empire). Cyrus originated from Persis (the modern-day Iranian province of Fars) and as such has played an instrumental role in the development of contemporary Iranian national identity.

The ancient Persian Empire was vast, and administering the wide territory and diverse population required a unique administrative system. The Persian Emperors created satraps, or governors, to rule a political district on behalf of the emperor.

The Persian Empire was founded by Cyrus the Great when he conquered the rival Medes and established the Achaemenid Dynasty. Darius I dramatically expanded Persian territory and invaded mainland Europe. Xerxes was repelled by Greek forces at the Battle of Salamis.

The Persian Empire was the most powerful in the known world for several generations in the centuries before the rise of Rome. It was based out of modern day Iran and indeed Iran is still called Persia in some languages and by some people. The Persian Empire is sometimes called the Achaemenid Empire.

The term "Persian Empire" is a fairly broad term that refers to many different empires, most of which directly followed on from one another, that were centered in Persia (modern-day Iran). The first "Persian Empire" was probably the Achaemenid Empire that began in the year 550 C.E. with the conquests of Cyrus the Great. The Seleucid, Parthian, and Sasanid Empires are all other examples of "Persian Empires." The Ayyubid's however were a Kurdish dynasty formed by Saladin and centered in modern-day Egypt.

The Sasanid Empire, also called the Sassanian Empire, was the last dynasty of the Persian Empire. It collapsed in an incredibly brief period, less than a decade, in the seventh century as it was overtaken by the rise of Islam and invading Caliphates.