Nigali Sagar's pillar inscription records Ashoka's enlargement of the stupa of the previous Buddha Konagamana.
Inscriptions at this site
Minor Pillar Edict (Nigali Sagar Version)
Minor Pillar Edict (Nigali Sagar Version)
Nigali Sagar
Ashokan inscription site — Nigali Sagar.
Pillar Edict