Noli turbare circulos meos!

It is said to have been uttered by Archimedes—in reference to a geometric figure he had outlined on the sand—when he was confronted by a Roman soldier during the Siege of Syracuse prior to being killed.

[1] According to Valerius Maximus, the phrase was uttered by the ancient Greek mathematician and astronomer Archimedes.

But, according to Valerius Maximus (Facta et dicta memorabilia, Book VIII.7), Archimedes just answered Noli, obsecro, istum disturbare[2] ("Do not, I entreat you, disturb that (sand)"), because he was so engrossed in the circles drawn on the sand in front of him.

[2] Valerius Maximus (Facta et dicta memorabilia, Book VIII.7) attests the Latin form "noli ... istum disturbare" ("I ask you not to disturb that sand").

In the modern era, it was paraphrased as Noli turbare circulos meos and then translated to Katharevousa Greek as "μή μου τοὺς κύκλους τάραττε!"