When was the document tale of heike written?

The Tale of the Heike (平家物語, Heike Monogatari) was written sometime between the late 13th and early 14th centuries.

It's important to note that the Tale of the Heike is not a single, unified work but rather a collection of stories and poems that were compiled and passed down orally for generations before being written down. Therefore, it's difficult to pinpoint an exact date of authorship.

However, scholars generally agree that the earliest written versions of the Tale of the Heike emerged sometime during the Kamakura period (1185-1333).