Sanghamitta was a Buddhist nun, the daughter of the emperor Ashoka. When women in Sri Lanka asked to be ordained, the island's king sent for her. She came carrying a branch of the very tree the Buddha sat beneath at Bodh Gaya, and brought it by river and sea in a golden vessel to the old capital, Anuradhapura.
There it was planted with great ceremony beside King Devanampiya Tissa, and it is still alive. Guinness lists it as the oldest human-planted tree with a known planting date. The tree it was cut from is gone; the one standing at Bodh Gaya today was grown in 1881 from a cutting of hers.
She founded the island's order of nuns, lived out her life in Anuradhapura, and died around 203 BCE. Her tree has outlived her by more than 2,200 years. Sri Lankans still mark her arrival every December full moon.