The reign of Sourigna Vongsa is considered the golden age of Laos. He ascended to the throne in 1633 [possibly 1637]. He assured stability by immediately banishing any possible rivals, sending one of his brothers to Vietnam and the other one into a solitary priesthood, and sending his cousins west, towards Siam. He was a strict and austere monarch, and ran the country according to firm laws. He was greatly respected as a ruler, and within five years of his ascension, his reputation reached the Dutch representatives of the Dutch East India Company who were in Phnom Penh. The Jesuit Giovanni Maria Leria arrived in Vientiane at the same time as the Dutch merchants [1641/1642].

Much of what we know about seventeenth-century Laos comes from the descriptions of these visitors. Despite the disruptions that spanned the period from Setthathirath's death to Sourigna Vongsa's ascension, Lan Xang, as Laos was called, apparently recovered very quickly. Both Van Wuystoff, the Dutchman, and Leria, who spent six years in Laos, were impressed with the nation's prosperity. Van Wuystoff noted the great number of monasteries and the monks, "more numerous than the soldiers of the King of Prussia." John Philip de Marini , who recorded and published Leria's visit, noted that monks went from Siam to Laos "as to University." The support of a large idle population, the monkhood, which harmed Laos' national economic development, nevertheless impressed both visitors. The first chapter of Marini's account is subtitled, The Greatness, Riches and Power of Laos. Both described the free market and flourishing trade, which supplied Europe with benzoin , lac, musk ("the first must that has appeared in Europe from this part of the world." - de Marini) and other products. The palace of the king, de Marini would describe,

"the structure and symmetry of which are remarkable can be seen from afar. It is truly vast and is so extensive that one would take it for a city... The King's quarters... have a very beautiful and magnificent façade... embellished inside and out with splendid bas relief gilded so finely that they appear to be covered with gold laminations.... I would have to fill an entire book... to describe all the other parts of the palace in detail, their richness, their apartments, their gardens...."

The king claimed to recognize no other as his equal, though he concluded friendly treaties with neighboring countries. With King Narai of Ayutthaya, he built the Phra That Si Song Rak (Stupa of the Affectionate Two) at Dan Sai (now in Loei province of Thailand) to commemorate their friendship and set the boundary of their kingdoms.

In contrast to his friend Narai, however, who received ambassadors with great pomp, wore splendid and elaborate vestments and enjoyed the use of the finest foreign luxuries -- velvets and rich Persian carpets, Sourigna Vongsa wore no crowns, and preferred sitting on reed mats. Though the mats of Lan Xang, were evidently more beautiful than they are today; de Marini writes of them, for example, that "the weaving is so delicate and the ornamentation with patterns and various leaf-works so well done that, in my opinion, there is nothing more beautiful and more pleasing to the eye;" it is apparent from the accounts of the foreign visitors that the great king lived a far from decadent life. Rather, they noted that he distributed his wealth in the service of religion.