Chronology & Timelines (Years 6–11) — History

Chronology is the ordering of events in time, using dates, centuries and eras to build clear timelines.

Chronology means putting events in the order in which they happened. Getting the order right is one of the very first skills a historian needs, because a cause must always come before its effect.

Why this matters Without chronology, history becomes a confusing jumble. Knowing which event came first lets us follow how one thing led to another and tell a clear story. Dates, centuries and timelines are the simple tools that keep the past in order, and every exam expects you to use them confidently.

Counting the years: BCE and CE

Historians measure years from a fixed point in time. Years before that point are labelled BCE (Before Common Era) and years after it are labelled CE (Common Era) — the same as the older BC and AD. In BCE the numbers count downwards as time moves forward.

300 BCE is further from zero than 200 BCE, so it happened earlier — BCE years get smaller as time moves toward the present.

Common exam mistake: writing that a bigger BCE number is more recent. It is the opposite — 300 BCE is earlier than 200 BCE, because BCE counts backwards toward year 0.

Working out the century

A century is a period of one hundred years. Use this reliable rule for CE years: take the first two digits of the year and add one — so 1485 falls in the 15th century (14 + 1).

Exam technique: when a question asks you to explain cause and consequence, state the exact years or century for each event first — examiners award marks for showing you understand the correct sequence, not just for naming the events.

Put these events in order, earliest first:

The First Civilisations of Mesopotamia (about 3500 BCE)
The Roman Empire at its height (about 117 CE)
The Golden Age of Islam in Baghdad (about 900 CE)
The Industrial Revolution begins (about 1760 CE)

Decades, eras and periods

A decade is ten years, such as "the 1960s". A longer stretch of time with a shared character is often called an era or a period, such as the medieval period — historians name periods to make the huge sweep of time easier to study.

Term	Length
Decade	10 years
Century	100 years
Millennium	1000 years