1660 followed by 1661
1660 (MDCLX) was a leap year starting on Thursday of the Gregorian calendar and a leap year starting on Sunday of the Julian calendar, the 1660th year of the Common Era (CE) and Anno Domini (AD) designations, the 660th  year of the 2nd millennium, the 60th  year of the 17th century, and the  1st   year of the 1660s decade. As of the start of 1660, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.