Iannis Karoussos (May 1, 1937 - August 4, 2013) was the acclaimed painter of post-Byzantine Monumental art. His enormous frescoes established the renewal of Byzantine painting. Between 1982 and 2013, Karoussos painted the two biggest churches of Greece, of around 1.5 acres each, St. Panteleimon in Athens and St. Andrew in Patras. These two monuments stand as the cradle of the vanguard of modern Byzantine art.                   

By combining his abstract expressionism with the Palaiologan Renaissance, he succeeded to introduce a radical shift from the conservative Byzantine painting to a new brand form of art and spirituality, deeply influenced by artists such as Kandinsky, Malevich, Newman, Pollock, Rothko, Kelly, and Kline. Through Karoussos' colour fields and action painting, a new era in Byzantine fresco painting has emerged, influencing the Byzantine monumental painting of the 20th century.