Which preposition to use with loyang

as Occurrences 1%

During the earlier years of his reign he chose the city of Loyang as his capitalnow the flourishing and populous town of Honanbut at a later period he removed it to Singanfoo, in the western province of Shensi.

in Occurrences 1%

The first act of the empress Wu had been to transfer the capital to Loyang in the east.

Which preposition to use with  loyang