bygone

relics of a bygone society.

His talk was evocative of the bygone days.

Let bygones be bygones.

the dusty precepts of a bygone era.

relics of a bygone age

The room had the elegance of a bygone era.

I’m willing to let bygones be bygones.

This is a ridiculous situation, avoiding each other like this. Why can’t we let bygones be bygones?

Let bygones be bygones and let's forget about our disputes and be friends again.