I remember a long time reading a text file from a package while browsing my /usr/share/docs about the history of Gregorian calendar date in the history, i think

I remember a long time reading a text file from a package while browsing my /usr/share/docs about the history of Gregorian calendar date in the history, i think it was pretty interesting but I can't find the name of that package of where this was located, (can't seem to be in coreutils/utils-linux except if that has been removed). if anyone would know what i am talking about, i'll be grateful to know the name of the package.