402 (CDII) was a common year starting on Wednesday of the Julian calendar, the 402nd year of the Common Era (CE) and Anno Domini (AD) designations, the 402nd year of the 1st millennium, the 2nd year of the 5th century, and the 3rd year of the 400s decade. As of the start of 402, the Gregorian calendar was 1 day ahead of the Julian calendar, which was the dominant calendar of the time.

• Saint Patrick, patron saint of Ireland