They were disciples of Saint Andrew the Apostle, the first missionary to the lands north of the Black Sea. They witnessed to Christ around the Danube River and converted many to the Faith. They were arrested and condemned, and died immersed to their necks in icy water.   In the Prologue, St Nikolai Velimirovich describes them as the “first Slavic martyrs mentioned in history.” In ancient martyrologies they are referred to as Scythians, a term applied to the peoples living around the Black Sea in the early Christian era. It is doubtful that they were members of the Slavic people as we understand them today, though it seems that they were the first martyrs in the lands that are now inhabited by the Slavic people.