大唐西域記 6.2.2

6.2.2

There are a couple of Deva temples, in which various sectaries worship (live). Within the royal precincts are some ruined foundation walls; these are the remains of the proper palace of Suddhodana-raja; above is built a vihāra in which is a statue of the king. Not far from this is a ruined foundation, which represents the sleeping palace of Mahamaya, the queen. Above this they have erected a vihara in which is a figure of the queen. By the side of this is a vihara; this is where Bodhisattva descended spiritually into the womb of his mother. There is a representation of this scene drawn in the vihara. The Mahasthavira school say that Bodhisattva was conceived on the 30th night of the month U-ta-lo-'an-sha-cha (Uttarashadha). This is the 15th day of the 5th month (with us). The other schools fix the event on the 23d day of the same month. This would be the 8th day of the 5th month (with us).