Czar Samuel was ruler of the First Bulgarian Empire at the end of the 10th and into the early 11th centuries. He spent most of his life expanding Bulgarian territory and fighting the Byzantine Empire but after his death the Byzantines triumphed and the Bulgarian Empire collapsed.
This sculpture, unveiled in 2015 on the 1,000 anniversary of Samuel’s death (he died in 1014, but close enough), generated controversy at the time partly because of the style, partly because of the location but mostly because of the glow in the dark eyes. The sculptor, Alexander Haitov, said that he glowing eyes ‘radiate internal heat’ but most people thought they were a bit silly. So when the LEDs behind his eyeballs died in 2018 they were not replaced.