Sei Shōnagon
The origins of "kakigōri" date back the Heian period in Japanese history, when blocks of ice saved during the colder months would be shaved and served with sweet syrup to Japanese aristocracy during the summer. Kakigōri's origin is referred to in "The Pillow Book", a book of observations written by Sei Shōnagon, who served the Imperial Court during the Heian period. Kakigōri became more accessible in the 19th century, when ice became more widely available to the public during the summertime. The first kakigōri store is believed to have opened in Yokohama in 1869.