1528 ( MDXXVIII ) was a leap year starting on Wednesday of the Julian calendar , the 1528th year of the Common Era (CE) and Anno Domini (AD) designations, the 528th year of the 2nd?millennium , the 28th year of the 16th?century , and the 9th year of the 1520s decade. As of the start of 1528, the Gregorian calendar was 10 days ahead of the Julian calendar, which was the dominant calendar of the time.