“The burial chamber itself is a beehive-shaped tholos. Inside it, archaeologists found fragments of a crown and an amphora, but the more important discovery was the bones of two people, a man and a woman, believed to have lived in the early third century BC. Many believe that the men remains are those of Prince Roigos, son of Seutus III, and that the female bones belong to his wife.”
An article by JULIUS PURCELL and ÁNGEL CARLOS AGUAYO PÉREZ https://www.nationalgeographic.com/history/history-magazine/article/kazanlak-royal-tomb-thrace-wwii-bulgaria
AGE FOTOSTOCK [National Geographic article]