The Collaborative International Dictionary of English v.0.48:

Chronicler \Chron"i*cler\, n.
   A writer of a chronicle; a recorder of events in the order of
   time; an historian.
   [1913 Webster]

         Such an honest chronicler as Griffith.   --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

chronicler
    n 1: someone who writes chronicles

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "chronicler":
   Boswell, annalist, autobiographer, autobiographist, biographer,
   calendar maker, calendarist, chronographer, chronologer,
   chronologist, clockmaker, diarist, genealogist, historian,
   historiographer, horologist, memorialist, timekeeper, timer,
   watchmaker