Prithvi Narayan Shah captured Kathmandu and Patan in 1768 and Bhaktapur a year later.
Prithvi Narayan Shah had captured Bhaktapur once before. 
mnli hypothesis: Prithvi Narayan Shah had captured Bhaktapur once before.  premise: Prithvi Narayan Shah captured Kathmandu and Patan in 1768 and Bhaktapur a year later.