The hangings on Wednesday were the first executions in the oil-rich Gulf state since mid-2013.
Those executed included two Kuwaitis, two Egyptians,, a Filipina, a Bangladeshi and an Ethiopian. They were convicted of offenses ranging from murder, attempted murder, kidnapping, and rape.
The Kuwaiti government identified the royal as Sheikh Faisal Abdullah Al Jaber Al Sabah and said he was convicted of premeditated murder and illegal possession of a firearm.
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, including women and children.
It was an apparent act of revenge against her husband for taking a second wife.
The Filipina and Ethiopian women were domestic helpers convicted of murdering members of their employers’ families in two unrelated crimes.
The two Egyptians were convicted of premeditated murders, while the Bangladeshi was convicted of abduction and rape.