What is the world's oldest surviving parliament?

The Althing in Iceland, founded around AD 930 at Thingvellir - an outdoor assembly held in a rift valley between two tectonic plates, chosen partly because the rock wall gave the law-speaker natural acoustics for reciting the laws from memory to the assembled free men.

It was not a parliament in the modern sense and it was not democratic - it was an assembly of chieftains and free farmers, with no vote for women, the enslaved or the poor. But it made and declared law, resolved disputes, and in the year 1000 took the decision that Iceland would become Christian, reportedly after the pagan law-speaker went away, lay under a cloak for a day and a night, and came back with a compromise permitting private pagan practice.

It has a gap. Iceland came under Norwegian and then Danish rule, and the Althing lost its legislative role and was finally dissolved in 1800 before being re-established in 1845 - so continuous is a claim that requires some generosity. The Isle of Man's Tynwald makes a competing case for continuity without interruption, and Iceland's is older by foundation. Both claims are made with some vigour and neither is quite clean.