2 sentences

1. 在古代，‘子’是五等爵位中的第四等。

   zài gǔ​dài,‘zǐ’ shì wǔ děng jué​wèi zhōng de dì sì děng.

   In ancient times, 'zi' (Viscount) was the fourth of the five ranks of nobility.

   Source: Dong Chinese Dictionary

2. 在古代的五等爵位制中，最后一等被称为男。

   zài gǔ​dài de wǔ​děng jué​wèi zhì zhōng, zuì​hòu yī​děng bèi chēng​wéi nán.

   In the ancient five-rank nobility system, the lowest rank was called Baron.

   Source: Dong Chinese Dictionary