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There are many studies concerning to Chang Pogo(張保皐)'s maritime activities. However not sufficient researches have been carried out on his birth origin, the time when he went over Tang(唐), his trading vessels, sailing route, calling ports and nautical instruments etc.. It seems that Chang Pogo was not come from slave class or lowest grade of the Silla(新羅) society but ruling class of the local society and he went over Tang at around 30 years old. The title of Chang Pogo Daesa(大使), 'Daesa' was general appellation of Tang society to the leading class people. Chang Pogo was also appointed as a general of the army and managed international trade as the representative. Therefore he would be called as Daesa before returning home, Silla, and placing military ...

There are many studies concerning to Chang Pogo(張保皐)'s maritime activities. However not sufficient researches have been carried out on his birth origin, the time when he went over Tang(唐), his trading vessels, sailing route, calling ports and nautical instruments etc.. It seems that Chang Pogo was not come from slave class or lowest grade of the Silla(新羅) society but ruling class of the local society and he went over Tang at around 30 years old. The title of Chang Pogo Daesa(大使), 'Daesa' was general appellation of Tang society to the leading class people. Chang Pogo was also appointed as a general of the army and managed international trade as the representative. Therefore he would be called as Daesa before returning home, Silla, and placing military camp, Jin(鎭) at Cheonghe(淸海). Eventually the government of Silla would have designated him Daesa as the chief of the Jin. Concerning to shipbuilding, long time ago Baekje(百濟)'s shipbuilding technique was transferred to Japan. A shipbuilding master of Baekje went to Japan to be the ancestor of Jeomyungbu(猪名部) which was solely engaged in woodworking. This Jeomyungbu made ships and devoted them to the government. In 7th Century Anyeguk(安藝國) of Japan made Baekje-seon(百濟船) to use as Tang-going-ship(遣唐船). In a while Sillaseon(新羅船) was appeared on the East Asian Sea. At the beginning of 9th Century Japanese government ordered Taejebu(大宰府) to build Sillaseon to overcome rough seas and supplied the ships to Daemado(對馬島) as tribute-carrying-vessel(貢物運搬船). In addition the government arranged a wholly responsible officer in charge of taking care of the Sillaseon to maintain its shape and movability. This Sillaseon was also a ship of Silla origin model. As the size of Sillaseon was modulated to its necessity in use, the Japanese Tang-going-ship would be approximately 250 tons in deadweight capacity. The shape of the ship's bottom was knife-shaped-bottomed suitable for ocean-going sailing. There are obvious evidences in Korean archaeology which are vessel-shaped earthernwares of Gaya(伽倻) and Silla at 5∼6th Century. Each of them is a knife-shaped-bottomed or flat-bottomed ship respectively. It is presumed that most suitable bottom mode would be adopted to the ship according to its carriage purpose and sailing district. Probably knife-shaped-bottom construction should have been composed for the sea-going vessel of the international trader to sail easily against big waves and swells. So called Chinese keel was attached to the bottom of the ship for strengthening it as well to role as centre-board. Chang Pogo Gyoguanseon(交關船) and other traders in 9th Century were sailing direct route in The Seohe(西海) and The East China Sea. And the calling ports would be whole ports in China including Guangju(廣州), Daemado and Bakda(博多) in Japan, and Ulsan(蔚山), Geochilsangun(거칠산군), Whangsanjin(黃山津) and Cheonghejin(청해진) in Silla. Still many researchers did not refer to Ulsan and Whangsanjin. Especially Ulsan which was the most adjacent port of Gyeoungju(慶州), the capital of Silla, would be the biggest port in the state. It is insisted that a South Pointer(指南器) was used in the East Asian Sea mostly after 10th Century. By the way a 1st Century letter-engraved South Pointer, Sikjeomcheonjiban(式占天地盤) was discovered in the Korean Peninsular. Provided natural magnetic loadstone is on hand it is not difficult to make a magnetic needle. In consideration of shipbuilding and navigation craft, and 2 boxes of magnetic stone tributed to Tang in the period of Munmuwang(文武王), it could be concluded that South Pointers were utilized on the Silla traders in 9th Century at The East Asian Sea. Sillaseon evidently should be arranged as Chang Pogo's trading vessel. This Sillaseon has definite position in the Korea Ship History and East Asia Shipbuilding History in view of its strength and wave-overcoming ability that was approved internationally. Present misunderstanding about Korean science and technology which would have been accomplished under the influence and immitation of Chinese culture, can be partly modified by the discovery of Sillaseon. Accordingly Sillaseon's appearance has great meaning in the Korea Ship History. It will be not wrong to say that the shipbuilding technique of Silla was most precedent among the three countries, Silla, Tang and Japan, as from the early time Sillaseon was adopted to Japanese government as their official use instead of Chinese ship model. Comparing orient with occident in the world ship history of 9th Century, naval architecture of the Orient was more progressive than the Occident's. Consequently we can imagine how the level of Silla's ship construction technology was in the world shipbuilding history.

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