By Century

This page groups deities by the earliest year a surviving written or inscribed source places them, sorting gods by how far back their documented worship can actually be traced. Archaeologists call this kind of earliest possible date a terminus post quem, which Wikipedia defines as "the earliest date the event may have happened or the item was in existence." Browsing by first attestation separates deities known from the oldest surviving records from ones who only appear in much later texts.