
The second millennium of the Anno Domini or Common Era was a millennium spanning the years 1001 to 2000.

The 11th century is the period from 1001 through 1100 in accordance with the Julian calendar, and the 1st century of the 2nd millennium.

The 12th century is the period from 1101 through 1200 in accordance with the Julian calendar. In the history of European culture, this period, is considered part of the High Middle Ages and is sometimes called the Age of the Cistercians. The Golden Age of Islam kept experiencing significant developments, particularly in Islamic Spain, Seljuk and Ghurid territories. Most of the Crusader states including the Kingdom of Jerusalem fell to the Ayyubid dynasty founded by Saladin, who overtook the Fatimids. In Song dynasty of China faced an invasion by Jurchens, which caused a political schism of north and south. The Khmer Empire of Cambodia flourished during this century. Following the expansions of the Ghaznavids and Ghurid Empire, the Muslim conquests in the Indian subcontinent till Bengal began to place in the end of the century.

The 13th century was the century which lasted from January 1, 1201 through December 31, 1300 in accordance with the Julian calendar. The term is often used to refer to the 1200s, the century between 1200 and 1299.

As a means of recording the passage of time, the 14th century was a century lasting from January 1, 1301, through December 31, 1400. The term is often used to refer to the 1300s, the century between 1300 and 1399. It is estimated that the century witnessed the death of more than 45 million lives from political and natural disasters in both Europe and the Mongol Empire. West Africa and the Indian Subcontinent experienced economic growth and prosperity.

The 15th century was the century which spans the Julian years 1401 to 1500. The term is often used to refer to the 1400s, the century between 1400 and 1499.

The 16th century begins with the Julian year 1501 and ends with either the Julian or the Gregorian year 1600. The term is often used to refer to the 1500s, the century between January 1, 1500 and December 31, 1599.

The 17th century was the century that lasted from January 1, 1601, to December 31, 1700. The term is often used to refer to the 1600s, the century between January 1, 1600, and December 31, 1699. It falls into the Early Modern period of Europe and in that continent was characterized by the Baroque cultural movement, the latter part of the Spanish Golden Age, the Dutch Golden Age, the French Grand Siècle dominated by Louis XIV, the Scientific Revolution, the world's first public company and megacorporation known as the Dutch East India Company, and according to some historians, the General Crisis. The greatest military conflicts were the Thirty Years' War, the Great Turkish War, Mughal–Safavid Wars (Mughal–Safavid War, Mughal–Safavid War ), Mughal–Maratha Wars, and the Dutch–Portuguese War. It was during this period also that European colonization of the Americas began in earnest, including the exploitation of the silver deposits, which resulted in bouts of inflation as wealth was drawn into Europe.
The 18th century lasted from January 1, 1700 to December 31, 1800. The term is often used to refer to the 1700s, the century between January 1, 1700 and December 31, 1799. During the 18th century, elements of Enlightenment thinking culminated in the American, French, and Haitian revolutions. During the century, slave trading and human trafficking expanded on a global scale. Revolutions began to challenge the legitimacy of monarchical and aristocratic power structures, including the structures and beliefs that supported the slave trade.

The 19th (nineteenth) century began on January 1, 1801, and ended on December 31, 1900. The term is often used to refer to the 1800s, the century between January 1, 1800 and December 31, 1899. The 19th century was the ninth century of the 2nd millennium.

The 20th (twentieth) century began on January 1, 1901, and ended on December 31, 2000. It was the tenth and final century of the 2nd millennium. Unlike most century years, the year 2000 was a leap year, and the second century leap year in the Gregorian calendar after 1600.

The Little Ice Age (LIA) was a period of cooling that occurred after the Medieval Warm Period. Although it was not a true ice age, the term was introduced into scientific literature by François E. Matthes in 1939. It has been conventionally defined as a period extending from the 16th to the 19th centuries, but some experts prefer an alternative timespan from about 1300 to about 1850.