 A notable "Phra Khlang Kosathibodi" during the reign of King Narai was Kosa Lek, who was the elder brother of the famous 17th-century Siamese ambassador to France Kosa Pan.Kosa Pan also became a "Phra Khlang Kosathibodi" upon the reign of Petracha.Soon after, a sub-department called "Kromma Tha" (, "Port Department") was created to deal with foreigners.