southeast asia?

Question

In the time period of 600-1450, what would be something really important that happened in southeast asia?

Oh yeah, it's CE.
Not BCE.

Answer 1

The spread of Islam.

Answer 2

Your forgot BC or AD!

600 BC--Rome conquers the city of Alba Longa.ªAlso in this year, Carthage fails to prevent the establishment of the Phocaean Greek colony at Massilia (Marseilles).

c. 600 BC onward--Pharaoh Necho II and his successors use the gold of Ophir to finance a reorganization of the Egyptian military. Necho and his successors were, in the OTL, somewhat innovative militarily, at least for Egyptians. They used Greek mercenary troops, for example, but this was limited by the lack of a strong treasury. In this ATL, with the gold of Ophir at his disposal, they raise a large infantry force, mostly native but supplemented by mercenaries, which is armed, equipped, and trained as Greek Hoplites. This force is supplemented by a large force of Egyptian and Nubian archers. They abandon their chariots and adopt armored horse archers and lancers based on those of the Assyrians and Babylonians. They also build a large navy and merchant fleet, based on Greek and Phoenician designs. With this revamped force, Egypt is much better able to defend itself and to expand than it was at the same period in the OTL. The continuing influx of gold from Ophir will allow later Pharaohs to perform reorganizations of the military as changing tactics and military technology call for it.

c. 600 BC to c. 350 BC--Expansion of Egypt in Africa. The rediscovery of Ophir leads to a reorientation of Egyptian foreign policy and military activity which lasts for the next two centuries. During this period Necho and his successors will not attempt anymore to expand into Asia, but will remain on the defensive there, instead focusing on expansion southward into Africa, which they recognize as the source of their wealth. Necho's successors Psamtik II and Wahibre I will conquer the Kingdoms of Kush and Axum (most of modern-day Sudan and Ethiopia). This gives the Egyptians ports on the Horn of Africa (much closer to the mines of Ophir), puts them in a good position to trade with India and other exotic regions, and Egypt grows wealthier still. Over the succeeding years, Egypt establishes a network of trading posts and military garrisons along the east coast of Africa, and then expands out from these to bring the entire coast of East Africa under their control. Finally, in the reign of Pharaoh Psamtik VII, an Egyptian army invades and occupies Ophir itself, bringing the region firmly under Egyptian control, where it will remain.
http://www.alternatehistory.com/discussion/archive/index.php/t-26778.html
This is about all I coud find maybe you can pick something out of this.