The Japanese used the Chinese characters (Kanji) to be their written language. I believe that you can basically write something in Kanji and both nationalities will be able to understand it. The spoken languages, however, sound nothing alike.

Tien is the Japanese pronounciation of the character for Heaven or Sky. Somewhere I have a Kanji book, if I ever find it, I will have more information.

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Hwæt! We Gardena in geardagum,
þeodcyninga, þrym gefrunon,
hu ða æþelingas ellen fremedon.