3 sentences

1. 在古代，天子也被尊称为辟。

   zài gǔ​dài, tiān​zǐ yě bèi zūn​chēng wéi bì.

   In ancient times, the emperor was also respectfully called 'Bi'.

   Source: Dong Chinese Dictionary

2. 古代中国认为皇帝是受命于天的天子。

   gǔ​dài Zhōng​guó rèn​wéi huáng​dì shì shòu​mìng yú tiān de tiān​zǐ.

   Ancient China believed the emperor was the Son of Heaven, ruling by divine right.

   Source: Dong Chinese Dictionary

3. 在古代仪式中，公爵朝见天子时通常需要手持青圭。

   zài gǔ​dài yí​shì zhōng, gōng​jué cháo​jiàn tiān​zǐ shí tōng​cháng xū​yào shǒu​chí qīng guī.

   In ancient ceremonies, dukes usually had to hold a green jade tablet when meeting the Emperor.

   Source: Dong Chinese Dictionary