The timeline divides into four major phases. First, the Indus Valley Civilization (Harappan) was the earliest urban civilization. Second, the Vedic Period (1500-600 BCE) saw the composition of Vedas and rise of kingdoms. Third, the Mauryan Empire (322-185 BCE) was India's first major empire.
Fourth, the Gupta Period (320-550 CE) is called the Golden Age of India