It was by far the biggest change in Saudi Arabia's tightly-controlled society yet ordered by the 88-year-old Abdullah bin Abdulaziz al-Saud, who took power six years ago with a reformer's reputation but has ruled as a cautious conservative.
In practice, the measure will do little to change how the country is run: Saudi Arabia's rulers allow elections only for half of the seats on municipal councils which have few powers. Only men will vote at the next elections which will take place next week; women will be allowed to vote in 2015.
The king did not address broader issues of women's rights in a country where women are not allowed to drive and require a male relative's permission to work or leave the country.