Pyramid of Khentkaus II. The pyramid had initially been excavated in 1906 by Borchardt. The structure was then thought to be a double mastaba and was not excavated very thoroughly. Seventy years later the Czech Institute conducted a thorough excavation of the site. The construction of the pyramid was likely started during the reign of her husband Neferirkare Kakai and finished during the reign of her son Nyuserre Ini. The pyramid was robbed during the First Intermediate Period. During the Middle Kingdom the pyramid was reopened and the sarcophagus reused for the burial of a young child. By the end of the New Kingdom the destruction of the site occurred when stones were taken form the site to be reused elsewhere.