Question:
Which employer did Eduard Winkelmann work for in Mar, 1861?

Context:
 Eduard Winkelmann works for Heidelberg University from Jan, 1873 to Jan, 1896. 
 Eduard Winkelmann works for Imperial University of Dorpat from Jan, 1865 to Jan, 1869. 
 Eduard Winkelmann works for University of Bern from Jan, 1869 to Jan, 1873. 
 Eduard Winkelmann works for Tallinn Cathedral School from Jan, 1860 to Jan, 1865. 
 Eduard Winkelmann works for Monumenta Germaniae Historica from Jan, 1859 to Jan, 1860.

Answer:
Tallinn Cathedral School