The phrase "more ancient" refers to something that is older or existed further in the past compared to its contemporaries. There are many synonyms that can be used in place of "more ancient." Some examples include "older," "prehistoric," "ancient," "antiquated," "archaic," "primeval," and "historic." Each of these terms has a slightly different nuance, but all convey a sense of greater age and timelessness. Whether discussing historical artifacts, geological formations, or cultural traditions, using synonyms for "more ancient" can add depth and interest to any writing or conversation.