How do I get inside the sanctuary?

Hint 1 of 7:

Only holy people can enter.

Hint 2 of 7:

Have you looked at the picture on the wall?

Hint 3 of 7:

It's of the founder of the temple.

Hint 4 of 7:

I'm sure the founder of the temple would be considered holy.

Hint 5 of 7:

You'll need to give a very large gift to the priest in 452 AD.
(See the previous question for more help.)