Hello
It is impossible to unconsciously plagiarise.

Quoting the number in the historical dates, or someone's historical writing or saying is obviously not plagiarism.
Plagiarism is content that has not been quoted or attributed to the author.

An honest writer does not need to check their own content if it can be detected for fraud.

The writing that has been stolen from the article that we sourced is not a historical date or name.
It is a description of the place that was written by someone else.