The north-western hybrid cultures of the subcontinent included the Indo-Greek, the Indo-Scythian, the Indo-Parthian, and the Indo-Sassinids. The first of these, the Indo-Greek kingdom, was founded when whenthe Greco-Bactirian King Demetrius invaded the region in 180BCE, extending his rule over various parts of present day Afghanistan andPakistan.Roman Trade with India
Roman trade with India started around 1 CE, during the reign of Augustus and following his conquest of Egypt , which had been India's biggest trade partner in West. The Gupta Empire which existed approximately from 320 to 550 CE and covered much of the Indian subcontinent, foundeed by Maharaja Sri-Gupta.This period is called the Golden age of India and was marked by extensive inventions and discoveries in science and technology, art and literature , rreligion and philosophy and in all branches of human civilisations.Scholars of this period include Aryabhatta, who is believed to be the first to come up with the concept of zero, postulated the theory that the earth revolves round thye sun, and studied solar and Lunar eclipsees.Kalidas as a good play write who is said to have inspired by Goethe, and marked the highest point, of sanskrit literature is said to have belonged to this period. 