Introduction to Jiuqiaomian: The treasure of the town hall - Jiuqiaomian (Ming Dynasty) was unearthed in 1971 from the tomb of Zhu Tan, the tenth son of Emperor Taizu Zhu Yuanzhang of the Ming Dynasty. It is the only well-preserved one found in my country. The actual crowns worn by princes in the early Ming Dynasty are also extremely valuable material for studying ancient costumes and etiquette in my country.