This is a puzzle. It is a colophon of Greek letters in an unsigned manuscript of Edmund Spenser relating to Ireland in I598. Someone with expertise in ancient Greek poetry or biblical studies (I presume) may be able to help. It is two lines of Greek letters with full stops/periods between them; the first has four or five letters if you run to the two Xs together and the other one three. In these sorts of manuscripts besides a signature you might expect something like God save the Queen or Laus Deo. But this is something else - a deliberate conundrum which Spenser an accomplished Greek scholar would have loved. It must been something that contemporaries would have been able to work out. It would have been difficult but feasible for those in the know. It might be a sort of acrostic of initials of some line of Greek poetry (Homer, Hesiod or a proverb) or some words from the Bible which he may have liked maybe the two Xs sugggest something religious.