Is one year old butter safe to eat?

Honestly, I would not eat it. It's a waste, but dispose PROPERLY of the butter. (Garbage, melt it...) Get some new butter. It would not be safe, no.

I would luv to add that if you think about it how many germs grow on butter (if not in the fridge and still if it is) in a day....just think about how many would grow in 365 days.