Iron Age (500 BC–600)The Achaemenid dynasty of the Persian Empire, founded by Cyrus the Great, ruled an area from Greece and Turkey to the Indus River and Central Asia during the 6th to 4th centuries BC. Alexander the Great conquered this empire in the 4th century BC. The Roman Empire would later control parts of Western Asia. The Seleucid, Parthian and Sassanian dynasties of Persia dominated Western Asia for centuries.
Foundation of the Maurya Empire(Sanskrit: मौर्य राजवंश, Maurya Rājavanśha) which was geographically extensive and powerful empire in ancient India, ruled by the Mauryan dynasty from 321 to 185 BC.It was one of the world's largest empires in its time. At its greatest extent, the empire stretched to the north along the natural boundaries of the Himalayas, and to the east stretching into what is now Assam. To the west, it probably reached beyond modern Pakistan, annexing Balochistan and much of what is now Afghanistan, including the modern Herat and Kandahar provinces. India was united for the first time in the Maurya empire. The Gupta Empire (Sanskrit: गुप्त राजवंश, Gupta Rājavanśha) was an Ancient Indian empire which existed approximately from 320 to 550 CE and covered much of the Indian Subcontinent. Founded by Maharaja Sri-Gupta, the dynasty was the model of a classical civilization.Maurya and Gupta empires are called as the Golden Age of India and were marked by extensive inventions and discoveries in science, technology, art, religion and philosophy that crystallized the elements of what is generally known as Indian culture.The religions of Hinduism and Buddhism, which began in India, were an important influence on South, East and Southeast Asia