Although his name appears in the article of August of the first year of the Tenpyo Era of "Shoku Nihongi" (Chronicles of Japan Continued) as 'Shonagon Shokage,' it was a position under the official rank system effective in 670 or before, and therefore, it is probable that Yasumaro died young soon after the Jinshin War.
ただ『続日本紀』「天平元年8月条」には官位役職は「少納言小花下」と見え、天智3年（670年）以前の官位制に基づいた名称となっており、ここから考察するに壬申の乱後幾ばくも経たない頃に早世したと考えられる。