Around 30,000 Greek bhikkhus had arrived in Anuradhapura from the monasteries of Alasanda (the city of the Yonas, Alexandria in present Afghanistan) according to Geiger’s Mahavamsa (chapter XX1X (39)) ...
Several Bhikkhus from Sri Lanka went to China, the most important being Amogavajra who taking 500 Tantric texts from Abhayagiri became an adviser to the Chinese Emperor and established sects in Korea ...