Romans 16:15 includes greetings to 'Nereus and his sister, and Olympas and all the saints with them.' Nereus was a common name in the Roman empire, derived from the Greek sea god Nereus, father of the Nereids. The name appears in inscriptions associated with imperial households, suggesting Nereus may have been a slave or freedman. Paul's mention of Nereus's unnamed sister alongside him hints at close sibling bonds within the early Christian community. The clustering of several names together ('all the saints with them') suggests house churches or extended household networks—the primary organizational structure of first-century Christianity before dedicated church buildings existed.