From Wikipedia:
Srivijaya (also written Sri Vijaya) was a dominant thalassocratic city-state based on the island of Sumatra, Indonesia, which influenced much of Southeast Asia. Srivijaya was an important centre for the expansion of Buddhism from the 8th to the 12th century. In Sanskrit, sri means “fortunate”, “prosperous”, or “happy”, and vijaya means “victorious” or “excellence”.
The earliest evidence of Srivijaya’s existence dates from the 7th century: a Chinese monk, Yijing, wrote that he visited Srivijaya in 671 for 6 months. The earliest known inscription in which the name Srivijaya appears also dates from the 7th century. Between the late 7th to early 11th century Srivijaya rose to become a hegemon in Southeast Asia, involved in close interactions — often rivalries — with neighboring Java, Kambuja and Champa. Srivijaya’s main foreign interest was nurturing lucrative trade agreements with China which continued from the Tang Dynasty to the Song era. Srivijaya had religious, cultural and trade links with the Buddhist Pala Empire of Bengal, as well as with the Islamic Caliphate in the Middle East. The kingdom ceased to exist in the 13th century due to various factors, including the expansion of the Javanese, Singhasari, and Majapahit empires.
By the 12th century, the kingdom included parts of Sumatra, the Malay Peninsula, Western Java, Borneo and the Philippines, most notably the Sulu Archipelago and the Visayas islands (and indeed the latter island group, as well as its population, is named after the empire).
Srivijaya remained a formidable sea power until the 13th century.
To learn more, got to: Wikipedia – Srivijaya