Conversation so far:
Who led the Sinhalese People?
Prince Vijaya and his 700 followers left Suppāraka, landed on the island at a site believed by historians to be near modern-day Mannar, and founded the Kingdom of Tambapanni.
Who else was the leader of the Sinhalese People?
The elected minister of the people Upatissa, the Chief government minister or prime minister and leading chief among the Sinhalese became regent and acted as regent for a year.

Question: What is it called?
Self-contained rewrite: What was the new capital by Upatissa called?