The second millennium of the Anno Domini or Common Era was a millennium spanning the years 1001 to 2000 (11th to 20th centuries; in astronomy: JD 2 086 667.5 – 2 451 909.5).. It encompassed the High and Late Middle Ages of the Old World, the Islamic Golden Age and the period of Renaissance, followed by the Early Modern period, characterized by the Wars of …

A millennium (plural millennia or millenniums) is a period of one thousand years, sometimes called a kiloannum (ka), or kiloyear (ky).Normally, the word is used specifically for periods of a thousand years that begin at the starting point (initial reference point) of the calendar in consideration (typically the year "1") and at later years that are whole number multiples of a …