The prince threatened to go into exile in Austria

Early results showed nearly two-thirds of the tiny principality's electorate had agreed to back Hans-Adam II's demands.

Correspondents say there was a bitter campaign leading up to the vote.

Hans-Adam even threatened to quit the country his family have ruled for 300 years if he did not like the outcome.

But that appeared forgotten once the first votes were counted.

"It's an excellent result. We can be very pleased with it," the prince told local radio.

Hans-Adam - Crown Prince of Liechtenstein since 1989 - already had the right to dissolve parliament and call elections.

But he wanted the power to hire and fire governments for the 160-square-kilometre (62-square-mile) country - the sixth smallest in the world.

Dictatorship fears

The prince's supporters claimed he simply wanted to iron out ambiguities in the constitution. But critics, like Sigvard Wolhwend of the Democratic Secretariat Party, warned that granting the prince more power could turn Liechtenstein into a dictatorship.

The BBC's Emma Jane Kirby in the capital, Vaduz, says the people of Liechtenstein faced a difficult dilemma.

Although many citizens oppose an absolute monarchy, they are also very attached to the royal family, she says.