Its ancient capital is found in northern Ethiopia, the Kingdom used the name "Ethiopia" as early as the 4th century. Aksum is mentioned in the 1st century AD "Periplus of the Erythraean Sea" as an important market place for ivory, which was exported throughout the ancient world, and states that the ruler of Aksum in the 1st century AD was Zoscales, who, besides ruling in Aksum also controlled two harbours on the Red Sea: Adulis (near Massawa) and Avalites (Assab). He is also said to have been familiar with Greek literature. It is also an alleged resting place of the Ark of the Covenant and home of the Queen of Sheba. Aksum was also one of the first major empires to convert to Christianity.