Also, the year 574 when Shotoku Taishi was born was Kinoeuma, which means the year of the horse, according to an astrological calendar and a motif of a female becoming pregnant by the power of the Bodhisattva of Compassion or the Taoist immortal might have been established in ancient China (the birth story of Shotoku Taishi also resembles the birth story of Buddha, who lived before Jesus Christ).
ちなみに出生の西暦574年の干支は甲午（きのえうま）でいわゆる午年であるし、また古代中国にも観音や神仙により受胎するというモチーフが成立し得たと考えられている（イエスよりさらに昔の釈迦出生の際の逸話にも似ている）。