Menkauhor Kaiu, (in Greek known as Menkeris), was Pharaoh in Egypt during the Fifth dynasty.

The Turin King List assigns him eight years of rule.

His pyramid has not been discovered but contemporary records indicate it was either located at Dahshur or Saqqara, rather than Abusir.

He is the last pharaoh to build a sun temple.

He is, historically, the second most obscure ruler after the ephemeral Shepseskare, although several references from royal officials, one major quarry inscription at Wadi Maghara in the Sinai, a single seal and a small alabaster statue prove his existence beyond doubt.

His successor, Djedkare Isesi is ascribed a relatively long reign of twenty-eight years from the Turin Canon though some Egyptologists believe this is an error for thirty-eight years.

Manetho ascribes him a reign of forty-four years, while the archaeological evidence suggests that his reign exceeded thirty-two years.

He did not, as had been customary for his dynasty, build his own sun temple, but did build his pyramid at Saqqara instead of Abusir.

This is believed to be a sign that Osiris had now replaced the sun-god Ra as the most popular god.

Titles were now thought to hold magical power; their inflation believed to be a sign of a gradual decentralization of power.