The Karnak temple at Thebes was begun around 2134 b.c. , marking the city's rise to prominence.
The beginning of the Karnak temple at Thebes marked the city's rise to prominence. 
mnli hypothesis: The beginning of the Karnak temple at Thebes marked the city's rise to prominence.  premise: The Karnak temple at Thebes was begun around 2134 b.c. , marking the city's rise to prominence.