When was the secret history by procopius created?

"The Secret History" by Procopius was likely composed around 550 AD, during the reign of the Byzantine Emperor Justinian I. This work is notable for its critical portrayal of Justinian and his wife, Theodora, contrasting sharply with Procopius's more official writings. It was not published until after Procopius's death, reflecting the sensitive nature of its content.