The poem is by Yamabe No Akahito, and appears in the book One Hundred Poems from the Japanese, translated by the American poet Kenneth Rexroth (1905-1982). The book was originally published in 1955 by New Directions.
In the book's notes, Mr. Rexroth writes that Akahito "lived during the reign of the Emperor Shōmu," which extended from the years 734 to 748. Akahito, he writes, is believed to have died in the year 736.
There is a reference in the poem to "Asuka," which, Mr. Rexroth explains, "was a former Imperial Palace site."
To view the poem more easily, please click on the image below.
(Images from the paperback edition of One Hundred Poems from the Japanese, 27th edition, © New Directions Publishing Corporation. Paperback edition first published in 1964.)