I want to know the answer to the following question:
Who was the viceregal Sakya regime overthrown by?
All the background I'm provided with is that "Wylie asserts that this type of censorship of the History of Ming distorts the true picture of the history of Sino-Tibetan relations, while the Ming court granted titles to various lamas regardless of their sectarian affiliations in an ongoing civil war in Tibet between competing Buddhist factions.". Is that enough to answer the question?