1600 followed by 1601
1600 (MDC) was a century leap year starting on Saturday of the Gregorian calendar and a leap year starting on Tuesday of the Julian calendar, the 1600th year of the Common Era (CE) and Anno Domini (AD) designations, the 600th  year of the 2nd millennium, the 100th and last year of the 16th century, and the  1st   year of the 1600s decade. As of the start of 1600, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.   In the Gregorian calendar, it was the last century leap year until the year 2000.