Why was jury duty created?

Answer 1

The jury system, including the draft of members of the public for jury duty, is intended to create unbiased juries who can make a decision about a trial based on their interest in justice rather than any personal interest. If members of the public were not called to jury duty, then judicial decisions would wind up in the hands of some kind of professional jurist, which tends to result in a bias toward the social class or group to which that jurist belongs. In European history, judges were for a very long time an instrument of social repression. The US wished to escape from that pattern.

Answer 2

Pericles started it in Greece