List of emperors of Tibet
The traditional list of the ancient Yarlung dynasty's Tibetan kings consists of 42 names. The earliest kings ruled before the Tibetan language was developed in the 7th century, and the verbal history of Tibet was thus written after their periods of rule. While there is a lack of contemporaneous biographical manuscripts detailing the lives of the first 26 kings, modern scholars note that the lives of the 27th king to the 32nd were better documented. The kings from Songsten Gampo, the 33rd king, to U dum Tsen the last king of the Yarlung dynasty, are well documented in many reliable Tibetan sources, and in Chinese and foreign sources. A unified Tibetan state is documented during the times of the kings number 31, 32, and 33. All of the earlier and later kings were known as representatives of the Yarlung dynasty, named after the Yarlung Tsampo River in the Yarlung Valley. Their titles more correctly translate as 'chief', and not as 'emperor' of Tibet. Traditional Tibetan titles for the king include  ("Chief") and  ("Divine Son"). List 
In the list the common transliteration is given first, the academic one in brackets. See also 
Pre-Imperial Tibet
Tibetan Empire
List of rulers of Tibet
List of Lönchen of Tibetan Empire

Notes

References
McKay, Alex (ed.). Tibet and Her Neighbors: A History (2003) Walther Konig. Tibet
Emperors