What is the X in X-mas?
1797, from Italian, "poem of six-lined stanzas," from sesto "sixth," from Latin sextus (see six). Invented by 12c. Provençal troubadour Arnaut Daniel. The line endings of the first stanza are repeated in different order in the rest, and in an envoi.
elaborate verse form employed by medieval Provencal and Italian, and occasional modern, poets. It consists, in its pure medieval form, of six stanzas of blank verse, each of six lines-hence the name. The final words of the first stanza appear in varied order in the other five, the order used by the Provencals being: abcdef, faebdc, cfdabe, ecbfad, deacfb, bdfeca. Following these was a stanza of three lines, in which the six key words were repeated in the middle and at the end of the lines, summarizing the poem or dedicating it to some person