(TITC) - In early 17th century, under Nguyen Lords’ reign, realizing importance of expanding borders and precious resources in the East Sea region of the country, especially in Hoang Sa (Paracel) Archipelago and Truong Sa (Spratly) Archipelago, Nguyen Lords set up “Hoang Sa Flotilla” to exploit sea products, measure sea routes, patrol the sea and plant the sovereignty landmarks in Hoang Sa Archipelago and Truong Sa Archipelago.