ἐν τούτῳ νίκα, [transliterated: en toutoi nika]

Source, in full

"In this sign thou shalt conquer" or "In this sign you will conquer", often rendered in its Latinized form: In hoc signo vinces; this motto is said to have been adopted by Constantine after his vision of a Chi Rho sign in the heavens just before his decisive battle with Maxentius, A.D. 312

Notes from Wikiquote

As recorded in the Life of Emperor Constantine [De vita Imperatoris Constantini] by Eusebius

More quotes by Constantine the Great

How pleasing to the wise and intelligent portion of mankind is the concord which exists among you!

Each one may have the free opportunity to worship as he pleases; this regulation is made we that we may not seem to detract from any dignity or any religion.

It is one thing acting with free will to enter into contest for immortality, another to compel others to do so by force through the fear of punishment. No one should greatly trouble another, rather, everyone should follow what his soul prefers.

If a Jew has bought and circumcised a Christian slave or one belonging to any other religious community, he may under no circumstances keep the circumcised person in slavery; rather, whoever suffers such a thing shall obtain the privilege of freedom.

If any Jew has purchased and circumcised a Christian slave or one of any other sect than his own, he shall not keep the circumcised slave in servitude, but the man who has suffered this outrage shall be granted the rights of liberty.

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Attribution

Quote text and notes from Wikiquote: Constantine the Great (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.