Leap year starting on Monday in the context of "Friday the 13th"

Year 27 BC was either a common year starting on Sunday, Monday or Tuesday or a leap year starting on Monday of the Julian calendar (the sources differ, see leap year error for further information) and a common year starting on Sunday of the Proleptic Julian calendar. At the time, it was known as the Year of the Second Consulship of Octavian and Agrippa (or, less frequently, year 727 Ab urbe condita). The denomination 27 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

1816 (MDCCCXVI) was a leap year starting on Monday of the Gregorian calendar and a leap year starting on Saturday of the Julian calendar, the 1816th year of the Common Era (CE) and Anno Domini (AD) designations, the 816th year of the 2nd millennium, the 16th year of the 19th century, and the 7th year of the 1810s decade. As of the start of 1816, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.

This year was known as the Year Without a Summer, because of low temperatures in the Northern Hemisphere, possibly the result of the 1815 eruption of Mount Tambora in Indonesia, causing severe global cooling, catastrophic in some locations.

1000 (M) was a leap year starting on Monday of the Julian calendar, the 1000th year of the Common Era (CE) and Anno Domini (AD) designations, the 1000th and last year of the 1st millennium, the 100th and last year of the 10th century, and the 1st year of the 1000s decade. As of the start of 1000, the Gregorian calendar was 5 days ahead of the Julian calendar, which was the dominant calendar of the time.

In the proleptic Gregorian calendar, it was a non-leap century year starting on Wednesday (like 1800).

A common year starting on Tuesday is any non-leap year (i.e. a year with 365 days) that begins on Tuesday, 1 January, and ends on Tuesday, 31 December. Its dominical letter hence is F. The most recent year of such kind was 2019, and the next one will be 2030, or, likewise, 2025 and 2031 in the obsolete Julian calendar, see below for more.

Any common year that starts on Tuesday has two Friday the 13ths: those two in this common year occur in September and December. Leap years starting on Monday share this characteristic. From July of the year preceding this year until September in this type of year is the longest period (14 months) that occurs without a Friday the 13th. Leap years starting on Saturday share this characteristic, from August of the common year that precedes it to October in that type of year.

1868 (MDCCCLXVIII) was a leap year starting on Wednesday of the Gregorian calendar and a leap year starting on Monday of the Julian calendar, the 1868th year of the Common Era (CE) and Anno Domini (AD) designations, the 868th year of the 2nd millennium, the 68th year of the 19th century, and the 9th year of the 1860s decade. As of the start of 1868, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.

Year 1112 (MCXII) was a leap year starting on Monday of the Julian calendar.

1700 (MDCC) was an exceptional century common year starting on Friday of the Gregorian calendar and a leap year starting on Monday of the Julian calendar, the 1700th year of the Common Era (CE) and Anno Domini (AD) designations, the 700th year of the 2nd millennium, the 100th and last year of the 17th century, and the 1st year of the 1700s decade. As of the start of 1700, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.

As of March 1 (O.S. February 19), where the Julian calendar acknowledged a leap day and the Gregorian calendar did not, the Julian calendar fell one day further behind, bringing the difference to 11 days until February 28 (O.S. February 17), 1800.