From restricting the authority of an Ottoman Sultan in 1808 to the election of a president by popular vote, Turkey's constitutional history is a story unto itself.
Test your knowledge about Turkey's upcoming vote on the constitution.
Polling stations have now closed in Europe but Turkish expatriates will still be able to vote at ballot boxes set up at borders up until April 16, referendum day.
We visited six districts across Istanbul and asked people from diverse backgrounds about their thoughts on the upcoming referendum, what they will vote, and why.
Turks will vote on April 16 on whether to amend their constitution. On the streets of Istanbul, voting "yes" or "no" has personal significance.
Turkish expats have started to cast their ballots in the country's constitutional referendum amid increasingly strained ties between Turkey and Europe, home to an estimated 2.5 million eligible Turkish voters.
Most citizens in Turkey's third largest city Izmir, a CHP stronghold, are expected to vote 'no' in the April 16 referendum on constitutional change. Among those leaning to 'yes' are minority Roma.
The refusal by the German and Dutch authorities to let Turkish ministers hold public rallies has spiraled into a diplomatic crisis, but will it persist?
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