Why did France annex Erfurt?

I just read that after defeating Prussia in 1806, most of the German states were organized into the Rheinbund, but for some reason, Erfurt, as the Principality of Erfurt, was annexed directly to France, as a "principality directly subordinated to the Emperor."

It seemed a bit random to me, and I was wondering, what was the reasoning behind this? According to a map I found, apparently, Erfurt was directly ruled by Prussia beforehand, but then, why not just fob it off onto one of Napoleon's relatives or give it to a neighboring prince?
 
I just read that after defeating Prussia in 1806, most of the German states were organized into the Rheinbund, but for some reason, Erfurt, as the Principality of Erfurt, was annexed directly to France, as a "principality directly subordinated to the Emperor."

It seemed a bit random to me, and I was wondering, what was the reasoning behind this? According to a map I found, apparently, Erfurt was directly ruled by Prussia beforehand, but then, why not just fob it off onto one of Napoleon's relatives or give it to a neighboring prince?
A bit of a late bump, but I just noticed this too. I think, from some short research, that Napoleon wanted to be the ruler, direct or indirect, or Erfurt because there was going to be a meeting of several European monarchs there. I guess he wanted them to meet him on his ground?
 
I don't think it would be the only reason : the convention could have happened in France or in previously annexed aeras, while it happened 2 years after the constitution of Erfurt principality.

Erfurt is a strategic place, in the middle of Germany and at the crossroad of many ways in and out of the country, explaining why it changed hands much regularly.
 
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