The stone over the gateway is immensely strong. But the wall builders
were afraid to pile too great a weight upon it. So they left a
triangular space above it. You can see how they cut the big stones with
slanting ends to do this. This triangle they filled with a thinner
stone carved with two lions. The lions' heads are gone. They were made
separately, perhaps of bronze, and stood away from the stone looking out
at people approaching the gate.
All books are sourced from Project Gutenberg