ash heap of history

A figurative location of irrelevance or obscurity doomed to be forgotten or ignored by humanity. These few ruins are all that remain of the once-proud civilization, now relegated to the ash heap of history. With our superior military might, we will eradicate this feeble rebellion and leave them atop the ash heap of history! The prime minister was singularly unremarkable, an effete leader who was quickly swept into the ash heap of history.