Digha Nikaya 1:1208
SUJATOBhūtapubbaṁ, ānanda, rājā mahāsudassano nāma ahosi cakkavattī dhammiko dhammarājā cāturanto vijitāvī janapadatthāvariyappatto sattaratanasamannāgato.
Once upon a time there was a king named Mahāsudassana who was a wheel-turning monarch, a just and principled king. His dominion extended to all four sides, he achieved stability in the country, and he possessed the seven treasures.