The two persian leaders who tried to conquer greece were:

The two Persian leaders who tried to conquer Greece were "King Darius I and his successor Xerxes I."

Darius the Great or Darious I was the fourth king of the Persian Achaemenid Empire.

Xerxes, also known as Xerxes the Great was the fifth king of kings of the Achaemenid dynasty of Persia. He was Darius´I predecessor, and as well as  Darius the Great, and he ran the empire at its territorial apex.  

The Greco-Persian wars were series of battles lasting for around 50 years in the 5th century BC.

The Persians tried to gain the territory of the Greek city-states, in multiple attemps.

the caste system in india is the paradigmatic ethnographic example of caste. it has origins in ancient india, and was transformed by various ruling elites in medieval, early-modern, and modern india, especially the mughal empire and the british raj.it is today the basis of educational and job reservations in india.it consists of two different concepts, varna and jati, which may be regarded as different levels of analysis of this system.

the caste system as it exists today is thought to be the result of developments during the collapse of the mughal era and the british colonial regime in india. the collapse of the mughal era saw the rise of powerful men who associated themselves with kings, priests and ascetics, affirming the regal and martial form of the caste ideal, and it also reshaped many apparently casteless social groups into differentiated caste communities.the british raj furthered this development, making rigid caste organisation a central mechanism of administration

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