challenge: What was the title of Thomas Wiliems' Latin-Welsh dictionary, completed in 1607?
  
  A. Geiriadur Cymraeg-Lladin
  B. Thesaurus Linguæ Latinæ et Cambrobritannicæ
  C. Lingua Cambrobritannica
  D. Dictionarium Linguae Latinae et Anglicanae
  Answer: 