天經地義 (Tiān jīng dì yì) (1) lit. heaven’s law and earth’s principle (idiom); fig. right and proper(2) the norms of Heaven and Earth(3) right and unalterable(4) a matter of course From https://baike.baidu.hk/item/%E5%A4%A9%E7%B6%93%E5%9C%B0%E7%BE%A9/14314 In 520 B.C., King Jǐng of Zhou (周景王), Ji Gui, passed away. Based on imperial rules, his eldest son Ji Meng (姬猛), who…