A scholar of the Heian period
Tenjin is Sugawara no Michizane, a scholar of Japan’s Heian period. Today he is honoured at about 12,000 shrines. Dazaifu Tenmangū, the subject of our source, is one of them.
To verify: Michizane’s dates, and how and when he came to be honoured as Tenjin; The number of Tenjin shrines, in the embassy article’s own words: accounts differ; Link to the embassy article on Dazaifu