李公蘊
The first cash coins of the Lý dynasty produced during the reign of Emperor Lý Thái Tổ were the "Thuận Thiên Đại Bảo" (順天大寶), these were among the largest early Vietnamese cash coins with a diameter of 25.5 millimeters. All known variants of this cash coin feature the Chinese character "Nguyệt" (月) on the top of their reverse sides.