Chao was a wet nurse for Phetracha, and also for Prince Narai on the following year, thus making Lek their foster brother.

Lek became a minister and also a trader, and had a deep trade rivalry with one of the King's favorite Aqa Muhammed Astarabadi of the Persian community until the latter was accused of corruption in 1677 and executed by having his mouth sealed shut in October 1679.

Later Lek put a Greek adventurer and trader Constantine Phaulkon into his service to help facilitating his trading business.

[2] Impressed by his talent, Lek introduced him into the court of King Narai in 1681 and Phaulkon began to work as a interpreter.

Phaulkon's ability to manage accounting and foreign affairs quickly gained the royal favor of the King.