A banyan tree in Uruvelā, on the banks of the Nerañjara, near the Bodhi tree. A week after the Enlightenment the Buddha went there and spent a week cross-legged at the foot of the tree. There he met the Huhuṅkajātika Brahmin. Vin.i.2–3 Two weeks later he went there again from the Rajāyatana. Vin.i.4 It was then that the Brahma Sahampati appeared to him and persuaded him to preach the doctrine, in spite of the difficulty of the task. Vin.i.5–7 When the Buddha wishes to have someone as his teacher, Sahampati appears again and suggests to him that the Dhamma be considered his teacher. AN.ii.20f. SN.i.138f.
By Ajapāla-nigrodha it was, too, that, immediately after the Enlightenment, Māra tried to persuade the Buddha to die at once. DN.ii.112 Several other conversations held here with Māra are recorded in the Saṃyutta. SN.i.103f.
Here, also, the Buddha spent some time before the Enlightenment. DN.ii.267
The Brahmā Sutta SN.v.167 and the Magga Sutta, SN.v.185 both on the four satipaṭṭhāna, and another Brahmā Sutta SN.v.232f. on the five indriyāni, were concerning thoughts that occurred to the Buddha on various occasions at the foot of this tree, when he sat there soon after the Enlightenment. On all these occasions Brahma Sahampati appeared to him and confirmed his thoughts. Several old brahmins, advanced in years, visited the Buddha during this period and questioned him as to whether it were true that he did not pay respect to age. To them he preached the four Thera-karaṇā dhamma. AN.ii.22