Year 1819 (MDCCCXIX Roman numerals are a numeral system of ancient Rome based on letters of the alphabet, which are combined to signify the sum of their values. The first ten Roman numerals are:) was a common year starting on Friday This is the calendar for any common year starting on Friday . Examples: Gregorian years 1999, 2010 & 2021 or Julian years 1910 & 1899 (see bottom tables) (link will display the full calendar) in the Gregorian Calendar The Gregorian calendar is the internationally accepted civil calendar. It was introduced by Pope Gregory XIII, after whom the calendar was named, by a decree signed on 24 February 1582, a papal bull known by its opening words Inter gravissimas. The reformed calendar was adopted later that year by a handful of countries, with other countries (or a common year starting on Wednesday This is the calendar for any common year starting on Wednesday . Examples: Gregorian years 1997, 2003 and 2014 or Julian year 1903 (see bottom tables) of the 12-day slower Julian calendar The Julian calendar, a reform of the Roman calendar, was introduced by Julius Caesar in 46 BC, and came into force in 45 BC . It was chosen after consultation with the astronomer Sosigenes of Alexandria and was probably designed to approximate the tropical year, known at least since Hipparchus. It has a regular year of 365 days divided into 12).
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