The present compound was begun by Malla kings in the 1500s and enlarged by Prithvi Narayan Shah after 1768.
Prithvi Narayan Shah began the compound in 1650. 
mnli hypothesis: Prithvi Narayan Shah began the compound in 1650.  premise: The present compound was begun by Malla kings in the 1500s and enlarged by Prithvi Narayan Shah after 1768.