Thesalian or Thessalian: How To spell?
The word Thesalian is misspelled against Thessalian, a noun meaning "A native or inhabitant of Thessaly."
Thessalian has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings the & alian which should not be misspelled with single 'S'
Wrong Spelling:  the-s-alian  Correct Spelling:  the-ss-alian 
Find more wrongly spelled words of Thessalian to spell it well.