Summary: Light of letters moved from the east to the west. Our fieldwork for these 20 years have found and identified no less than 3.000 engraved rocks and holy altar (Iwakura) rocks at about 600 ruins in Japan.

Our studies on petroglyphs and rock art used to be scholarshipped by Ministry of Education (4 times), by Government of Fukuoka (6 times), and by Shimonaka Science Foundation (2 times) besides Governmental Boards of Education at Gifu pref., Kumamoto pref., Tokushima pref. And Oita pref. It is not to be overlooked that at every prefecture, province, city and town, chapter members of Japan Petroglyph Society joined and helped every fieldwork.

Judging from all such integrated data and finds, we can safely suppose that a lot of waves of cultures with many peoples flowed into prehistoric Japan from various places over seas and lands somehow. Through our studies, we have found that Sumerian, Celtic, Indian Arabian and other western cultures continued to flow into the Far East waves after waves, although traditional academism in Japan used to insist that main cultural waves were from china and Korea with stoneheaded belief that there had been no alphabets or letters before Kanji, Chinese letters were officially introduced into Japan by Yamato Dynasty. This stubborn thesis, however, has come to be forced to fade or denied by scholars of foresight and labour who belong mainly to the Institute for their Studies of American Cultures and the Epigraphic Society both of which consist of members of the Harvard School or the States Universities of America, who had been long proposing their theses that Sumerian or Celtic waves of cultures must have washed the Japanese islands in prehistoric ages until they naturalized there.

I used to be of the opinion that Sumerian and Celtic letters had effected a lot in making of the earliest Japanese alphabets before Kanjis (Chinese letters) were officially adopted in the 600's by the Yamato Dynasty at Nara.

However, a big find at a hill in the Kunisaki peninsula, Oita pref. On Jan15, 1999 changed my idea. The 53 engraved alphabets on a big rock about 4 meter square worked in deciphering the enigmas of the history of human letters. I was easily able to decipher all the engraved earliest Japanese alphabets with a certain letter-code, which was familiar to some mountain tribes, "Sanka", who used to live in higher mountains since prehistoric ages.

The "Sanka letters" and "Toyokuni letters" were used mixed on a big rock at Myoken hill, Kunisaki town, Oita pref. The decoded letters led me to declare,

"Long before the ages when Sumerian, Celtic, Mohenjodaro, and Hebrew alphabets were given birth to, a certain kind of peculiar Japanese alphabets did exist. Those earliest Japanese alphabets were carried by royal delegates out to the oldest world, and at every place based upon the introduced Japanese alphabets independent peculiar alphabets were made; Rune, Sumerian, Sanscrit, Linear and old Hebrew alphabets have such origin to the Far Eastern alphabets".

Here I was able to say, "Culture of letters rose in the Far East and it moved to the west just like the Sun rises in the east and sets in the west". The reason is very simple: on the altar rock are 53 alphabets which could be decoded as follows:

"Tomiaki-tarashi-nakaoki-tenno" (on the north face) and "Koko-wo hore, Simo-ha toku, Hiwa-no Kami noriyo, Shi Fukiaezu Netsugi yodai, Temuda". In English it says:"I am the 25th Tenno, whose name is Tomoaki-tarashi-nakaoki", and "This is my order, cultivate here, especially at the foot of this hill. Pray for the Sun God". I tried to know who was the 25th Tenno, but in the official history books of Japan, "Nihon-shoki" and "Kojiki" there was no such a name. Then other unofficial history books, "Uetsu-fumi" and "Takenouchi-monjo" both of which had been conserved secretly by two noble families and shrines helped me very easily. The both say, "Before the first Tenno of Jinmu, there were 71 Tennos who all belonged to the Ugaya-fukiaezu dynasty. The 25th Tenno was Tomiaki-tarashi who sent his princes to the world in order to spread the alphabets of his own making. The 26th Tenno did succeed the same work. It is why Libyan, Hebrew and other oldest dynasties came to have alphabets for their use". By the way, the dating of the 25th and the 26th dynasties was 12.000 BC. according to the both documents. In a sense, the Iwakura (altar) rock found at Kunisaki peninsula did show us the origin of the earliest letters and was enough to present us evidence of the truth of what the both history books recorded to tell us then.

Authorities of archaeology or linguistics in Japan had been neglected such a history book besides the official "Kojiki" and "Nihon-shoki" for long time. It was a tragedy in Japanese academism, because since the end of the World War every people was made to believe there was no prehistoric ages Japan before 2.000 BC. when for the first time, the Jinmu Tenno (Emperor) founded the first dynasty as the Son of the Sun God. Therefore no academic research was allowed to scholars to disclose the enigmas of the earliest Japan. But now, with a lot of discoveries of petroglyphs (engravings) and rock art, we have become able to decipher enigmas and know how human culture of letters rose and diffused with migration of people and civilization.