Dr. Ferdinand Johann Wiedemann

Wiedermann (1805-1887), who was a member of the St. Petersburg Academy of Sciences, was an Estonian linguist of German-Swedish ancestry, who had a great influence on the development of the written Estonian language. Working in the field of Finno-Ugric languages and history, he directed great attention to the phraseology of the Estonian vernacular and the vocabulary of Estonian dialects. His Grammatik der Estonian Sprache... (1869) contains the largest body of Estonian from that time.