History
Indian scholars wrote about the Dvipantara or Jawa Dwipa Hindu kingdom in Java and Sumatra around 200 BC. Southeast Asia was frequented by traders from eastern India, particularly Kalinga, as well as from the kingdoms of South India.
The Taruma kingdom occupied West Java around 400. There was a marked Buddhist influence starting about 425.
These seafaring peoples engaged in extensive trade, which attracted the attention of the Mongols, Chinese and Japanese, as well as Islamic traders, who reached the Aceh area of Sumatra in the 12th century.
Some scholars have pointed out that the legends of Ikshvaku and Sumati may have their origin in the Southeast-Asian myth of the birth of humanity from a bitter gourd. The word Ikshvaku means "bitter gourd". The legend of Sumati, the wife of King Sagar, tells that she produced offspring with the aid of a bitter gourd.
Read more about this topic: Hinduism In Southeast Asia