Chronograph

 Chronograms or Chrono-graphs

are riddles in which the letters of the Roman notation in a sentence or series of words are so arranged as to make up a date. The following is a good example:
My Day Closed Is In Immortality.
The initials MDCIII. give 1603, the year of Queen Elizabeth's death. Sometimes the Chronogram is employed to express a date on coins or medals; but oftener it is simply used as a riddle:
A poet who in blindness wrote; another lived in Charles's reign; a third called the father of English verse; a Spanish dramatist; the scolding wife of Socrates; and the Prince of Latin poets,—their initials give the year of the Great Plague—MDCLXV.—1665: Milton, Dryden, Chaucer, Lope-de-Vega, Xantippe, Virgil.
The word comes from Chronos , time, and gramma , a letter. 

Begin Well and End Better.