For the writers who first gave feudalism its name, the existence of feudalism presupposed the existence of a noble class.
Statements
conditional (presupposed) / belief (for the writers)
Inventors of the word "feudalism" believed: feudalism → noble class exists
pivot / rebuttal (yet / although) conditional (unless)
noble class → titles indicating noble status and inheritance sanct by law
facts
Feudalism existed in the 8th century.
Prior to the 12th century, there was no legal recognition of how one could inherit noble status through hereditary lines.
Evaluate
A lot of common Most Supported patterns seem to converge here: we've got a Conditional idea whose contrapositive is being triggered by a fact. And we've got an initial position that the author seems to be reubtting.
Let's start with the conditional + contrapositive. The "unless" conditional allows us to say that,
.
The final fact in the paragraph says that until the 12th century, there was no legal way to show hereditary transfer (i.e. inheritance) of noble status.
Thus, we know that prior to the 12th century, there was not really a noble class.
This goes against the writers who first gave feudalism its name. They thought that feudalism required a noble class, but feudalism existed in the 8th century, even though we know that prior to the 12th century there wasn't yet a noble class.
Goal
Look for a safely worded answer dealing with the fact that feudalism (in the 8th century) seemed to exist even though there wasn't yet a noble class, which goes against the thinking of the writers who first gave feudalism a name.