Kuwait hanged seven people at its central prison on Wednesday, including a Bangladeshi citizen and a prince in the ruling Al-Sabah family, according to a statement carried by state news agency KUNA.
It appeared to be the first time a member of the royal family has been put to death in Kuwait, where the emir has ultimate say over affairs of state.
Sheikh Faisal Abdullah Al-Jaber Al-Sabah was sentenced to death in 2010 for killing his nephew, another prince, according to Kuwaiti newspapers. Al-Sabah's crime was "premeditated murder and possession of a firearm and ammunition without a license," KUNA added.
They are the first executions in the oil-rich Gulf state since mid-2013.
Those executed included two Kuwaitis, two Egyptians and one each from Bangladesh, the Philippines and Ethiopia, the KUNA state news agency reported, citing a source at the public prosecution.
Sheikh Faisal Abdullah Al-Sabah, the first royal to be executed in the emirate, was convicted of killing another member of the ruling family in 2010 over a dispute.
Nusra al-Enezi, the other Kuwaiti, was convicted of setting fire to a tent in 2009 during a wedding party for her husband, killing around 57 people, many of them women and children.
It was an apparent act of revenge against her husband for taking a second wife.
She threw petrol on the tent, where dozens of women and children were celebrating inside, and burned it down in one of the most devastating crimes in the history of Kuwait.
The Filipina and Ethiopian women were domestic helpers convicted of murdering members of their employers' families in two unrelated crimes.
The two Egyptians were also convicted of premeditated murders while the Bangladeshi was convicted of abduction and rape.