Exact/proper interpretation

[Coolfootluke]

Re: Exact/proper translation

Seemingly the verb "remain" holds all the ambiguity here. However my and my professor's different viewpoints are about "for the reign of" which I interpreted as "from the reign of" and my professor held it "during the reign of". Probably these two interpretations somehow depend on exact interpretation of "remain" too!

I am not a teacher.

"For" does not mean "during" here. It means "for our purposes as students of history".