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When did Tibeto-Burman speakers begin to move into peninsular Southeast Asia?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
Thematic map showing the geographic distribution of Sino-Tibetan language families in East and Southeast Asia. Green areas indicate Sinitic (Chinese) languages across most of China and Taiwan, pink marks Tibetic languages in Tibet and surrounding regions, yellow shows Burmic (Burmese) in Myanmar, and red highlights Baric (Bodo-Garo) and Karenic (Karen) languages in parts of Northeast India, Bhutan, and Thailand. Country boundaries and major bodies of water are labeled for context.
Sino-Tibetan languages

Tibeto-Burman speakers began to penetrate into peninsular Southeast Asia during the middle of the 1st millennium of the Common Era. At that time, the region was already inhabited by speakers of Austronesian and Mon-Khmer languages.1