The Iranian plateau is a geographic area that has always been ethnically and linguistically heterogeneous but Cyrus the Great, a Persian, was the first local to found an imperial dynasty.

The Iranian plateau has never been homogenous.

Alexander the Great did enter the area but he conquered the pre-exiting Achaemenid empire.

The Persian empire was always heterogeneous; although over time some tribal groups were suppressed, homogeneity was never an ideological goal of the empire which sought to rule the whole world.

The Ottomans existed thousands of years after the Achaemenid empire had already fallen, and Cyrus the Great was not installed by any foreign power.

Cyrus the Great is remembered as the founder of the Persian Empire. Cyrus ruled from 559 BCE until 530 BCE and laid the foundations for the subsequent growth of the Persian Empire.

Darius I is often remembered as the great administrator of the Persian Empire. It was during his rule that satraps emerged. Satraps were provincial governors, given control over satrapies (districts/provinces). This allowed Darius I to control a large empire without having to directly oversee each individual province.

Solon was a notable Athenian statesman and reformer who lived in the sixth and fifth centuries B.C.E. He is primarily remembered for the legal reforms that he encouraged which are often credited with laying the foundation for the development of Athenian democracy. Solon restructured Athenian law in an attempt to correct the moral and political decline of Athens and to prevent tyrannical rule.

Darius I is one of the most famous rulers of the classical Persian Empire. He ruled over a vast territory and is most often remembered for his efficient administration, his bureaucratic reforms, and his improvements in internal infrastructure - including the construction of the Persian Royal Road and the establishment of a postal service.

Darius I is generally remembered for his impressive administrative reforms within the Persian Empire. During, and immediately after, his rule the Persian Empire was divided into a series of districts (called satrapies), which were managed by a governor (satraps).

While not a democracy in the modern sense, Athens allowed citizens to cast votes that determined who held public office; however, as in most early or proto-democracies the definition of citizen was very stringent; a citizen had to be a free, male landowner. Democracy was also not a perpetual state of affairs in the city; it slipped in and out of dictatorship and oligarchy.

The Delian League was founded by Athens to continue fighting the Persians. Eventually, Athenian handling of the league led to the Peloponnesian War. After the war, the Delian League was disbanded and most of its members joined the Peloponnesian League.

Theodora emerged from extremely humble beginnings to become one of the wealthiest and most influential women in the world in the sixth century C.E. She married Justinian I and served as the Empress of Byzantium for two decades until her death. Historical accounts of her life describe her as an extremely charismatic and confident ruler who contributed immensely to the greatness of Justinian’s reign.

While the other answers are all partly true, the true purpose of each triumvirate was to tacitly ally the most powerful men in Rome in such a way that everyone's interests were promoted. The understanding was that each man would have the support of the others when need be. This was supposed to protect Rome's interests and increase individual wealth. Naturally, this state of affairs could not stand for long; when the balance of power became too uneven, Civil War followed each time.