In the Sassanian Empire, Roman reports that it was common for men to have multiple wives. The hierarchy of the Sassanian harem is not clear. The Sassanian kings had one chief consort, who was the mother of the heir to the throne, as well as several wives of lower rank and concubines, all of whom accompanied him on travels, even on campaings. Five titles are attested for royal women: “royal princess” ("duxšy", "duxt"); “Lady” ("bānūg"); “Queen” ("bānbišn"); “Queen of the Empire” ("šahr bānbišn") and “Queen of Queens” ("bānbišnān bānbišn"). The rank of these titles has been the matter of debate and it appears that their status varied depending on circumstances and that the highest female rank was not necessarily borne by the chief wife, but could be held by a daughter or a sister. The Sasanian harem was supervised by eunuchs, and also had female singers and musicians.