真命天子

zhēnmìngtiānzǐ
  1. (historical) preordained emperor
  2. one's Mr. Right or (less commonly) Miss Right
  3. preordained emperor

Wiktionary

Entry Composition

1 真命 zhēnmìng
  1. to receive heaven's command (of Daoist immortals etc)
  2. ordained by heaven
2 天子 tiānzǐ
  1. the (rightful) emperor
  2. "Son of Heaven" (traditional English translation)