Ниусерра
Userkaf was the first king to build a sun temple in Abusir. Known to the ancient Egyptians as the "Nekhenre", or "Fortress of Re", it was unfinished at his death. Construction works continued in at least four building phases, the first of which may have taken place under Sahure, and then under his successors Neferirkare Kakai and Nyuserre Ini.