Grágás — Icelandic Commonwealth Law (c. 930–1262)

The body of law that governed the Icelandic Commonwealth — one of history's most remarkable stateless societies — from its founding at the Althing in 930 AD until Norwegian annexation in 1262. Grágás (Grey Goose Laws) is among the most detailed surviving early medieval law codes. The Commonwealth operated without a standing executive or monarch: law was enforced through private prosecution, outlawry, and social sanction rather than a state apparatus. A compelling historical case study in polycentric law and decentralised dispute resolution.