Calendar years are first-class citizens at NumberWiki: every integer from 1 to 2100 has a permanent page. While each page currently focuses on the mathematical properties of the number, future enhancements will surface historical and cultural context for years where it's notable.
The range 1–2100 covers all of recorded history (in the Gregorian sense) plus a future buffer. Years before 1 ("BCE") and far-future years are not currently included as year-tagged pages.