 Most of the regalia of these kingdoms, however, have been lost at various points in time, due to the successive rise and fall of the Korean dynasties and the subsequent and frequent raiding of Korean royal tombs and palaces by both Korean and foreign armies.The surviving regalia derive mainly from the Silla, Gaya, Baekje and Joseon dynasties.The crowns of Silla are noted for their exquisite gold and jade workmanship, which resulted from the spread of goldsmithing technologies from Egypt and Mesopotamia to Korea via the Silk Road.