Janus:

Roman god of doors,re-presented with two heads facingopposite directions,lookingboth before and behind; the two-faced god雅努斯，古罗马的门神，生有两个头，两张脸，一个看前面，一个看后面；两面神。
△Mer.1.1.50: “Now by two-headed Ja-nus.” 凭着双头的雅努斯起誓。
△Oth.1.2.33: “By Janus,Ithink no.”凭两面神起誓，我想不是。

Janus