the year 1300 (mccc) was a leap year starting on friday (link will display the full calendar) of the julian calendar, the 1300th year of the common era (ce) and "anno domini" (ad) designations, the 300th year of the 2nd millennium, the 100th and last year of the 13th century, and the 1st year of the 1300s decade. the year 1300 wasn't a leap year in the proleptic gregorian calendar.