Short answers, pulled from the story.
Jetavana was donated by Anathapindika, described as the Buddha's chief male patron. He purchased the park from Prince Jeta and funded the construction of the monastery at a combined cost of fifty-four crores, with Prince Jeta contributing the gateway using the eighteen crores he received for the land.
Jetavana was where the Buddha delivered the majority of his teachings and discourses. He spent nineteen out of his 45 monsoon retreats at Jetavana, more than at any other monastery.
Prince Jeta refused to sell the park and jokingly said he would agree if Anathapindika covered the entire ground with gold coins. Anathapindika took the offer literally and arrived with wagons of gold. When Prince Jeta tried to back out, arbitrators ruled he had to sell at the stated price.
An inscription found by Daya Ram Sahni in 1908 confirmed that Jetavana was active as late as 1128-29 CE. The inscription recorded a grant by the Gahadavala king Govindachandra to the sangha at Jetavana, naming Buddhabhattaraka as the head of the community.
Jetavana is located just outside the ancient city of Savatthi in what is now Uttar Pradesh, India. It is currently a historical park containing remains of monasteries, stupas, and structures including the Gandhakuti, and forms part of the Buddhist pilgrimage route in North India.
The Anandabodhi Tree is a Bodhi tree planted in front of Jetavana's gateway by Anathapindika. It is now considered the second-holiest tree in Buddhism and remains one of the significant features of the Jetavana historical park.