Al-Asir, an outspoken critic of the Lebanese Shiite Hezbollah movement, refused to recognize the court's authority.
The court also sentenced al-Asir's brother and seven others to death in the same case.
Famous Lebanese-Palestinian singer Fadel Shaker, who was close to the cleric, was sentenced to 15 years in jail in absentia.
The rulings are final.
In 2013, clashes erupted in Lebanon's southern city of Sidon between al-Asir's followers and the Lebanese army, leaving 18 soldiers and an unspecified number of the cleric's followers dead.
Two years later, al-Asir was arrested at Beirut airport, where he was to trying to flee the country using a fake passport.
Al-Asir became famous in Lebanon for his sermons following the 2011 uprising in neighbouring Syria against the regime of President Bashar al-Asad.
In his sermons, al-Asir backed the Syrian opposition and lashed out at Iran and Hezbollah, who are key allies of al-Assad.
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The court also sentenced al-Asir's brother and seven others to death in the same case.
Famous Lebanese-Palestinian singer Fadel Shaker, who was close to the cleric, was sentenced to 15 years in jail in absentia.
The rulings are final.
In 2013, clashes erupted in Lebanon's southern city of Sidon between al-Asir's followers and the Lebanese army, leaving 18 soldiers and an unspecified number of the cleric's followers dead.
Two years later, al-Asir was arrested at Beirut airport, where he was to trying to flee the country using a fake passport.
Al-Asir became famous in Lebanon for his sermons following the 2011 uprising in neighbouring Syria against the regime of President Bashar al-Asad.
In his sermons, al-Asir backed the Syrian opposition and lashed out at Iran and Hezbollah, who are key allies of al-Assad.
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