Johann Christoph Dommerich - lived in the mid 17th century

I started thinking about Johann Christoph Dommerich, 'the first of the line whom certain knowledge exists." (Of course, from where? Who has this knowledge?) The book Our Colonial and Continent Ancestors: The Ancestry of Mr. and Mrs. Louis William Dommerich reveals that "he was a citizen and master boot-maker at the town of Erfurt, Germany and lived during and after the middle of the seventeenth century. He married Maria Magdalene Bode and had a son of the same name as his own..."

That's all I have to go on.

With that information, I put together a little outline:

Erfurt in 1650 (Taken from Wikipedia)

1. Johann was born in the middle of the 17th century in Erfurt, Germany
1. There was a University in Erfurt – being in existence from 1379
1. Means educated people
2. People from all over the area; cosmopolitan environment
2. Erfurt was the capital of Thuringia and geographically the center of modern Germany (which of course does not come about until 1871)
1. The city is still intact and it is a medieval city (see above)
2. The city was situated on the Via Regia, a medieval trade and pilgrims road network
1. Again, lots of different people blowing through town
3. The city lost its independence in 1664, the time when Johann was wandering through the streets
4. The Electorate of Mainz built a fortress on Petersburg Hill between 1665 and 1726 ‘to control the city and instituted a governor to rule Erfurt.'
3. The cathedral has been there for 1,200 years
1. Martin Luther was ordained in this Cathedral in 1507
4. The Ottoman Empire was expanding during this time and was held back at the Battle of Vienna in 1683
2. Johann was a citizen
1. Does this mean he owned land?
3. Johann was a master boot maker
1. Is this a respected profession?
2. Would he be educated if he were a master bootmaker? 
4. Wife was Maria Magdalene Bode

Photographs taken from Wikipedia.

Alter of the Cathedral

Cathedral on the left