(261003) -- SOFIA, Oct. 3, 2026 -- Bulgarian Prime Minister Rumen Radev (1st L) and other officials welcome the remains identified as those of Tsar Samuel, who ruled the First Bulgarian Empire from 997 to 1014, at the airport in Sofia, Bulgaria, Oct. 3, 2026. Greece and Bulgaria signed a protocol Saturday on the reciprocal handover of cultural artefacts, under which 48 Greek artefacts will return from Bulgaria, while Greece will hand over to Bulgaria the remains identified as those of medieval Bulgarian ruler Tsar Samuel, Greek national broadcaster ERT reported. After the handover ceremony in Greece, the remains identified as those of Tsar Samuel, who ruled the First Bulgarian Empire from 997 to 1014, arrived in Bulgarian capital of Sofia