Unduvap (full moon Poya day in December)
Arrival of the Bo-tree sapling, Sangamitta
The Bo-tree sapling was brought to Sri Lanka from India by Buddhist Theri Sanghamitta, and it is this very tree that is venerated by Buddhists in Anuradhapura. It is also the oldest documented tree in the world. Sanghamitta Theri established the Bhikkhuni Sasana (the Order of Nuns) in Sri Lanka.
Read more about it under the Bhikkhuni lineage tab