U.S. District Judge Cecilia M. Altonaga sentenced 48-year-old Miami resident Anthony Gignac to 18 years in prison Friday for impersonating a member of Saudi Arabia’s royal family to swindle about $8 million from investors in the United States, Canada, United Kingdom, Switzerland and Hong Kong.

Since May 2015, Gignac pretended to be Prince Khalid Bin Al-Saud while running fraudulent investment company Marden International LLC with a co-conspirator.