In Heijyo-kyo, where the capital of Japan was located in 710, there were a market called 'nigimedana' where seaweeds were sold and a market called 'mohadana' where processed nori and kelp like tsukudani were sold.
和銅3年（710年）に遷都された平城京には、海草類を売る「にぎめだな」、海苔やコンブを佃煮のように加工したものを売る「もはだな」という市場が存在した。