Kingdom of Laos
In March 1957, he returned to Vientiane where he received a wild welcome. On 10 April 1957, he traveled to Luang Prabang by car and was received by an enormous crowd of citizens, government officials, and members of the police and the army. On 16 April he paid a courtesy call to King Sisavang Vong and was given back his old title of Uparaja of the Kingdom of Laos. In December 1957 he visited Samneua and Phongsaly where Souphanouvong symbolically offered the return of the Pathet Lao's two regrouping provinces to the Kingdom of Laos.