Juṇha Jātaka (No.456)
Once the Bodhisatta was born as Juṇha, son of Brahmadatta, king of Bārāṇasī. He studied in Takkasilā and, on one occasion, while walking in the dark, he ran up against a brahmin, knocking him down and breaking his bowl. Juṇha raised the brahmin to his feet and, on being asked for the price of a meal, told the brahmin who he was. He had no money with him, but requested the brahmin to remind him of the circumstance when he should become king. In due time Juṇha was anointed, and the brahmin stood one day by the road when the king was passing on his elephant. The brahmin stretched out his hand, crying, “Victory to the king.” Juṇha took no notice, so the brahmin uttered a stanza to the effect that a king should not neglect a brahmin’s request. Juṇha then turned back, and the man explained who he was, asking Juṇha for five villages, one hundred slave girls, one thousand ornaments and two wives, all which Juṇha gave him.
The story was related in reference to the eight boons granted by the Buddha to Ānanda when the latter became his constant attendant. Ānanda is identified with the brahmin (J.iv.95‑100).
See also the Nānacchanda Jātaka.