Bosch scholar and folk literature specialist. Fraenger's father was a judge and twice mayor of Erlangen, Emil Karl Hermann Fraenger; his mother was Wilhelmine Jacobine Fraenger. He entered the university in Heidelberg in 1910, beginning his art writing career with reviews of contemporary art shows for the Heidelberger Zeitung in 1912, including Alfred Kubin und Max Zachmann. Fraenger was awarded a prize by the University in 1913 for an essay, "Kunsttheorie des 17.

Describes and discusses art in books 34-36 of Historia Naturalis. Using a biomorphic paradigm to describe artistic development, Pliny uses a birth/development/decline method to art which would be highly influential for the art methodology of the middle ages and renaissance. In this sense he carries on the legacy of Xenokrates influencing as late a scholar as Johann Joachim Winckelmann. Pliny avoided discussing works of art as isolated examples of history.