# data[].attributes.headline
793 - Vikings raid Lindisfarne in Northern England. Seen as beginning of age of Viking raids.

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793 - Vikings raid Lindisfarne in Northern England. Seen as beginning of age of Viking raids.

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800 - At least 60% of population is a serf.

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800 - At least 60% of population is a serf.

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800s - Horseshoe and horse collar become more widely used

# data[].attributes.subject
800s - Horseshoe and horse collar become more widely used

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1000 - Warming period begins.  Aids agriculture and production.

# data[].attributes.subject
1000 - Warming period begins.  Aids agriculture and production.

# data[].attributes.headline
1054 - East-West Great Schism (Roman Catholic Church in west splits from Eastern Orthodox Church in east)

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1054 - East-West Great Schism (Roman Catholic Church in west splits from Eastern Orthodox Church in east)

# data[].attributes.headline
1076-77 Henry IV of Germany and pope in conflict over lay investiture

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1076-77 Henry IV of Germany and pope in conflict over lay investiture

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1100s - Three field/crop rotation farming system

# data[].attributes.subject
1100s - Three field/crop rotation farming system

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1164 - Henry II of England attempts to increase royal authority over lords and Church

# data[].attributes.subject
1164 - Henry II of England attempts to increase royal authority over lords and Church

# data[].attributes.headline
1192 - Third Crusade ends in truce between Richard and Saladin

# data[].attributes.subject
1192 - Third Crusade ends in truce between Richard and Saladin

# data[].attributes.headline
1378-1417 Great Schism (multiple popes in Rome and Avignon)

# data[].attributes.subject
1378-1417 Great Schism (multiple popes in Rome and Avignon)

# data[].attributes.headline
1415 Battle of Agincourt: Henry V of England wins battle against French

# data[].attributes.subject
1415 Battle of Agincourt: Henry V of England wins battle against French