Not long before this time, between 2575 2550 b.c. , King Kephren had the Sphinx erected in his honor at Giza.
King Kephren is also responsible an impressive number of the pyramids found at Giza. 
mnli hypothesis: King Kephren is also responsible an impressive number of the pyramids found at Giza.  premise: Not long before this time, between 2575 2550 b.c. , King Kephren had the Sphinx erected in his honor at Giza.