Born in Germany to merchant parents in
1855, Thedieck moved to America with his family when he was just 16. After attending
public school in Dayton, he moved to Sidney when he was 20 years old. Taking after his
father, Thedieck started in the dry goods business in 1875. His first partner was Philip
Raterman.
After Raterman retired just three years later, I.H. Thedieck entered into partnership
with his brother, Joseph. Thedieck Bros. was born. At the same time, I.H. made one of his
best decisions. On October 16, 1878, he married Ida Wagner, daughter of Mathias Wagner, the most influential man
in town.
Thedieck Bros. was destined to last only four years. In 1882, with the help of his
father in law, Thedieck struck out on his own. Wagner purchased the lot to the north of
the court house on Poplar Street to build the most modern shopping facility in town. Young
Thedieck rented half the space, with W.H. Wagner, one of Matthias' sons, occupying the
other half. By employing hard work and novel marketing efforts, Thedieck built a
thriving business.