There was extensive trade and communication in the 6th through 8th Centuries from the Middle East to Japan. Uniform gifts of silk were sent from each leader to each other head of state.
I visited Nara, the capital of Japan for that period, and was taken by Jay Gluck, a Persian anthropologist to one of the Emperor's storehouses that was open on one particular day.
I was invited to see a stack of 4 foot wide by 4 foot long silks that were each separated by a piece of newspaper. This was the day that the entire stack, 5 feet high, was re-stacked from the top, aired out and new paper interleaved between the silks.
This stack of large square silks had been gifts to the Japanese
emperors on their ascension to the throne over a two century period
from the 5th to the 7th Century. The silks came from every empire between
the Mediterranean and Japan. The silks were marked with a small tab of
fabric. Many came from Persia and the Sogdian empire as well as every part of India, every Chinese province and many Mongolian tribes. These silks were
beautiful and fresh.
Most of the Japanese emperors at that time and earlier were women. Here is a list of the Japanese emperors going back three millennia. The ones who received the gifts I saw were in the range of 44th to 50th emperor. We are currently on the 125th Japanese emperor.
I once listened to a Japanese friend on a late night cross country drive from Tokyo to Kanagawa recite all the Japanese Emperors to me...it was a feat of memory required of all Japanese High School students.