1748 followed by 1749
1748 (MDCCXLVIII) was a leap year starting on Monday of the Gregorian calendar and a leap year starting on Friday of the Julian calendar, the 1748th year of the Common Era (CE) and Anno Domini (AD) designations, the 748th  year of the 2nd millennium, the 48th  year of the 18th century, and the  9th   year of the 1740s decade. As of the start of 1748, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.