Gupta empire because it currently has my interest.
During the era of the Gupta empire there was a "Gupta year". An article refers to it and my first question is: what date would the birthdate of Wikidata be in Gupta years?
Obviously there are many maps including the Gupta empire, Can I have them sorted by date please? What other countries border the Gupta empire? Who were its rulers and how does the map change over time?
To get answers is nice but for me it is important that the algorithms involved are relevant to any country old and new. Relevant to timelines old and new. When we can express dates in the "Year Gupta", we can check if dates in Wikidata are indeed Julian or maybe Gregorian..
When we have continuance in maps over time, we will know if a location, a city for instance or the land of a tribe is part of what country; what culture.
Wikidata live long and prosper :)