(Article needs further work)
see also the comparison Janus Alpha and Omega
Here the possible reference to Janus is pronounced, both the gates and the alpha and omega are exam pled.
12 “Look, I am coming soon! My reward is with me, and I will give to each person according to what they have done. 13 I am the Alpha and the Omega, the First and the Last, the Beginning and the End. 14 “Blessed are those who wash their robes, that they may have the right to the tree of life and may go through the gates into the city. 15 Outside are the dogs, those who practice magic arts, the sexually immoral, the murderers, the idolaters and everyone who loves and practices falsehood.
Revelation 22:12