 Important Kaldu regions in southeastern Babylonia were Bit-Yâkin (the original area the Chaldeans settled in on the Persian Gulf), Bet-Dakuri, Bet-Adini, Bet-Amukkani, and Bet-Shilani.Chaldean leaders had by this time already adopted Assyro-Babylonian names, religion, language, and customs, indicating that they had become Akkadianized to a great degree.The Chaldeans remained quietly ruled by the native Babylonians (who were in turn subjugated by their Assyrian relations) for the next seventy-two years, only coming to historical prominence for the first time in Babylonia in 780 BCE, when a previously unknown Chaldean named Marduk-apla-usur usurped the throne from the native Babylonian king Marduk-bel-zeri (790–780 BCE).