The Collaborative International Dictionary of English v.0.48:

Marian \Ma"ri*an\, a.
   Pertaining to the Virgin Mary, or sometimes to Mary, Queen of
   England, daughter of Henry VIII.
   [1913 Webster]

         Of all the Marian martyrs, Mr. Philpot was the
         best-born gentleman.                     --Fuller.
   [1913 Webster]

   Maid Marian.
   (a) See Maidmarian in the Vocabulary.
   (a) A prominent character in the legend of Robin Hood.
       [1913 Webster]

WordNet (r) 3.0 (2006):

Marian
    adj 1: of or relating to or venerating the Virgin Mary