Bast
Protector of Cats
One reason the Odeon is good is that you can conquer a city with a Colosseum and immediately have a culture building in it. (All buildings that were already producing culture get destroyed, but Colosseums don't produce culture.)
If it weren't for this, I would much rather have the happy/health than three culture and artist slots.
This can be huge. I've found this really useful. I once conquered a city and looked into the built list and saw an Odeon and thought it was a bug. And then I realized. Oh it's just a colosseum and they already have one. Neat!