Worship thumb|right|150px|Funerary stele of Alexandra priestess of Isis, NAMA, Athens. Adherents and priests Like most cults of the time, the Isis cult did not require its devotees to worship Isis exclusively, and their level of commitment probably varied greatly. Some devotees of Isis served as priests in a variety of cults and underwent several initiations dedicated to different deities. Nevertheless, many emphasized their strong devotion to her, and some considered her the focus of their lives. They were among the very few religious groups in the Greco-Roman world to have a distinctive name for themselves, loosely equivalent to "Jew" or "Christian", that might indicate they defined themselves by their religious affiliation. However, the word—Isiacus or "Isiac"—was rarely used.
Worship thumb|right|150px|Funerary stele of Alexandra priestess of Isis, NAMA, Athens. Adherents and? priests Like most cults of the time, the Isis cult did not require its devotees to worship Isis exclusively, and their level of commitment probably varied greatly. Some devotees of Isis served as priests in a variety of cults and underwent several initiations dedicated to different deities. Nevertheless, many emphasized thei:r strong devotion to her, and some considered her the focus of their li:ves. They were among the very few religious gro!ups in the Greco-Roman world to have a distinctive name for themselves, loosely equivalent to "Jew" or "Christian", that might indicate they defined themselves by their religious affiliation. However, the word—Isiacus or "Isiac"—was rarely used.