The collection of Heike Nokyo (sutras donated by the Taira clan) owned by Itsukushima-jinja Shrine was designated a national treasure in the category of painting, not in the calligraphy or book category.
厳島神社の平家納経は「書跡・典籍」の部ではなく「絵画」の部で国宝に指定されている。