n.e. - "AD ", the abbreviation used in the Polish language, indicating the date from the early Christian era, which is tied to the start date of the birth of Jesus Christ (according to the Gregorian calendar). Corresponds to the Latin shortcut A.D. or AD (Anno Domini - "year of the Lord ') and the English CE (Common Era). Before appointment early Christian era, years were counted from the foundation of Rome. Only after nearly 500 years after Christ's death, Pope John I decided to