The Collaborative International Dictionary of English v.0.48:

Medieval \Me`di*e"val\, Medievalism \Me`di*e"val*ism\,
Medievalist \Me`di*e"val*ist\ .
   Same as Mediaeval, Mediaevalism, etc.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Mediaevalist \Me`di*ae"val*ist\ (m[=e]`d[i^]*[=e]"val*[i^]st),
   n.
   One who has a taste for, or is versed in, the history of the
   Middle Ages; one in sympathy with the spirit or forms of the
   Middle Ages. [Written also medievalist.]
   [1913 Webster]