That, plus personal ties, led Pakistan's former ruler Pervez Musharraf to come knocking in 2006.
But its military ruler, General Sani Abacha, has done none of the things demanded of him.
In 1965, Sheikh Sabah al-Salem al-Sabah became ruler of Kuwait following the death of his brother.
Yet Morocco's ruler is less cursed and more kissed than his fellow Arab kings.
They are nice, if unspectacular, attributes for a ruler or a high priest to aspire to.
In 1974, Portugal's authoritarian ruler Marcelo Caetano was overthrown in a military coup, surrendering to Gen.
Uganda's president, Yoweri Museveni, looks increasingly like a dynastic ruler bent on enriching his clan.
Ismail Khan, the ruler of Herat, has expressed concern over the fiery suicides in his fief.
This is the Mexica ruler at the height of his power, a god among gods.
Frederick was a polymath: ruler, soldier, poet, philosopher, musician, prolific correspondent and much else besides.
In 1324 it tried and failed to persuade Lithuania's great pagan ruler, Gediminas, to adopt Christianity.
After the roller-coaster ride through Judges, ancient Israel rejected God and sought a ruler.
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Many Turkish-Cypriots have left for a better life in Britain, one-time ruler of the island.
Sheikh Muhammad seems to get on well with Sheikh Khalifa bin Zayed al-Nahyan, Abu Dhabi's ruler.
Chaos have rocked Mali since a military ruler overthrew the democratically-elected president in March.
Colonel Pierre Buyoya, Burundi's current ruler, said in a Christmas speech that security had improved.
In short, Jordan, bereft of its famous ruler, will be cut down to size.
Confusingly, too, Egypt's next ruler will take on a post without a job description.
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He certainly became the prototype of the ideal ruler, and the Sumerian kings claimed descent from him.
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Pakistan's top court has ordered former military ruler Pervez Musharraf to respond to allegations he committed treason.
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To say a ruler is legitimate is to say that he has a recognised right to rule.
The most senior is an ethnic Tajik with close links to Herat's former Tajik warlord-ruler, Ismail Khan.
What, they ask, will happen when Mr Museveni goes and perhaps a less good ruler takes over?
Sheikh Khalifa in effect runs Bahrain, although his elder brother, Isa al-Khalifa, has been ruler since 1961.
He was not only the ruler's younger brother, he was also president of the Olympic Council of Asia.
Although he refused to be drawn on the scandal in his post-race remarks, Dubai's ruler was clearly relieved.
Pakistan's military ruler, General Pervez Musharraf, has said his country and Iran will co-ordinate their policies on Afghanistan.
He was cranky man who smoked a pipe and kept slapping an L-shaped pica ruler into his palm.
The Almighty and Merciful God, who is the Creator of the Universe, is also its Lord and Ruler.
Oman's ruler, Sultan Qaboos, has been outspoken in his calls to his countrymen to accept any job offered.
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