Where is the Minotaur's lair?

Hint 1 of 5:

It's on the lower level of the catacombs.  You need to fall down a pit to get
down there.

Hint 2 of 5:

There is one square from which you can hear the minotaur.

Hint 3 of 5:

If you don't get killed on that square, you should figure out how to enter.

Hint 4 of 5:

There is a room with a tapestry just to the east.

Hint 5 of 5:

You should recognize that tapestry from looking through the hole-in-the-wall.