THE LIFE OF THE BUDDHA: CHAPTER II – QUEEN MAHAA MAAYAA’S DREAM
One night Queen Mahaa Maayaa had a dream. She dreamt that the Devas from the four directions of the earth took her to Lake Anotatta on top of the Himalayan mountain. She was bathed in the lake and dressed in heavenly clothes and ornaments. A white baby elephant carrying a white lotus flower in its trunk trumpeted, and after circling around her three times, entered her body.
The next morning she told King Suddhodana of her dream. He consulted some wise men who, on hearing the dream said, “The Queen will have a wise and noble baby boy.” The king and queen were very happy for they had no children and were longing for a child.
Source: Budsas.net