Year zero
Year zero does not exist in the anno Domini system usually used to number years in the Gregorian calendar and in its predecessor, the Julian calendar. In this system, the year is followed by . However, there is a year zero in astronomical year numbering (where it coincides with the Julian year ) and in ISO 8601:2004 (where it coincides with the Gregorian year ) as well as in all Buddhist and Hindu calendars.
1444
Year 1444 (MCDXLIV) was a leap year starting on Wednesday (link will display the full calendar) of the Julian calendar. It is one of eight years (CE) to contain each Roman numeral once (1000(M)+(-100(C)+500(D))+(-10(X)+50(L))+(-1(I)+5(V)) = 1444).