Kaysone Phomvihane
On 2 December 1975 in Vientiane, Prince Vong Savang submitted the letter of abdication of King Savang Vatthana to the Pathet Lao. The Lao People's Democratic Republic was established with Prince Souphanouvong as President. Kaysone Phomvihane acted as Prime Minister and Secretary-General of the Lao People's Revolutionary Party.