Interestingly, as written, it is ΚΑΚΙωΝ not ΚΑΚΙΩΝ.

Originally there was no minuscule/majuscule (uppercase/lowercase) distinction in Greek writing (or Latin for that matter). They did have handwritten forms designed to be written faster, which is what the ω is in this case. Of course, those handwritten forms evolved often evolved into the forms we think of as lowercase forms today.