Referenced In

The Travels of Marco Polo
by Marco Polo, da Pisa Rusticiano

"It commenced on the west bank of the Wei, opposite Pao-ki h’ien, 100 miles west of Si-ngan fu..."

The Travels of Marco Polo
by Marco Polo, da Pisa Rusticiano

"From Ch’êng-tu viâ Si-ngan to Peking the road does not touch Han-chung, but 20 li west of the city strikes north to Pao-ch’eng."