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Based on the sutras, the Vinaya and later commentaries
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His son Rāhula is born

Attested across multiple schools

The Bodhisatta's wife bears a son, named . That Rāhula was the Bodhisatta's son is recorded in the texts of every major school, but the canonical texts themselves do not say when he was born. The later commentaries of the Southern tradition say he was born on the day the Bodhisatta went forth, and that the Bodhisatta looked in on his wife and son that night before leaving, and left without picking him up; the Chinese Mūlasarvāstivāda Vinaya says instead that the wife conceived on the night of the going forth and gave birth only on the day of the Awakening.

Different Accounts

The time of birth: the later commentaries of the Southern tradition have the day of the going forth, and also cite another account that he was already seven days old at the going forth; the Buddha biography Buddhacarita says he was born before the going forth; the Guoqu xianzai yinguo jing and Fo benxing ji jing say he was conceived before the going forth; the Chinese Mūlasarvāstivāda Vinaya says he was conceived before the going forth and born on the day of the Awakening.

More differences between accounts (3)

The origin of the name: the later commentaries of the Southern tradition say that on hearing of his son's birth the Bodhisatta said “Rāhu is born, a bond is born” (“Rāhu” means an obstacle), and the king therefore named him Rāhula; the Chinese Mūlasarvāstivāda Vinaya says he was named because there was an eclipse of the moon at his birth.

The pregnancy: the Chinese Mūlasarvāstivāda Vinaya says that while the Bodhisatta practised austerities his wife also reduced her food, and the child in the womb grew weaker day by day; the Buddha biographies Puyao jing (the Chinese Lalitavistara) and Fangguang da zhuangyan jing say that when the Buddha returned home after the Awakening, the Sakyans wondered how the prince, twelve years away from the country, could have a son.

Born on the same day: the Chinese Mūlasarvāstivāda Vinaya says that on the same day King Dhotodana (the Bodhisatta's uncle) also had a son, named .

Dating

On the account of the later commentaries of the Southern tradition (“the day of the going forth”), the Buddha aged twenty-nine; on the account of the Chinese Mūlasarvāstivāda Vinaya (“the day of the Awakening”), thirty-five. The sources differ; it can be fixed to a day, but there is no settled answer.

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Research Notes: Reliability, Dating and Sources
How Reliability Is Assessed

Recorded by four schools: the Pali canon of the Southern tradition, the Chinese Dharmaguptaka Vinaya (Sifen lü), the Chinese Mahīśāsaka Vinaya (Wufen lü) and the Chinese Saṅghabhedavastu of the Mūlasarvāstivāda Vinaya. Attested across multiple schools.

Dating Evidence and Precision

Stated in the canonical text (the text itself gives the time); commentarial dating (the canonical texts give no date; later commentaries record it). Time precision: fixed to the day.

Sources

Back to The Buddha at 29

Source text

日期怎麼讀

成道第幾年
從佛陀成道開始,每經過一次雨季安居算一年,每一年算到安居結束為止;所有年歲一律依二十九歲出家、三十五歲成道推算。
年份依據
區分經文自己明記、後世註解書記載、先後順序推定及年歲換算。
時間精確度
分別說明確定到日、月、年,或只能放入某幾年之間。
可信度
多派共傳、兩派記載、單派記載與後世補述,表達記載的共傳範圍;與時間及位置是否確定分開閱讀。