The church that is in their house (tēn kat' oikon autōn ekklēsian). The early Christians had no church buildings. See also Act 12:2; 1Co 16:19; Phm 1:2; Col 4:15. The Roman Christians had probably several such homes where they would meet.
Epainetus (Epaineton). Nothing is known of him except this item, “the first-fruits of Asia” (aparchē tēs Asias). An early convert from the province of Asia. Cf. Act 2:9; 1Co 16:15 (about Stephanas and Achaia).