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The Chấn line (Vietnamese: chi Chấn; Hán tự: 支震; chi can also be translated to as branch) was the fourth dynasty of Hùng kings of the Hồng Bàng period of Văn Lang (now Vietnam). Starting approximately 2252 B.C., the line refers to the rule of Bửu Lang and his successors, when the seat of government was centered at Phú Thọ.