Sebastian Denis de Souza is an English actor. He first gained popularity by portraying Matty Levan in the E4 teen drama series Skins. He has since starred in the period television series The Borgias from 2012 to 2013, Kids In Love (2016), Medici: Masters of Florence (2018), and The Great (2020). In 2013 he co-founded with actor Will Poulter the TV and film production company Good Soil. The following year he created his own brand management called de Souza aimed at helping young storytellers, producers or filmmakers develop their scripts.