Francenbergum, vel ut alij Francoburgum Hassiae Opp.

A decorative map with bird's-eye view of Frankenberg by Braun and Hogenberg. CAPTION: Frankenberg or, according to others, Francoburgum, a town in Hesse.
COMMENTARY BY BRAUN: "Charlemagne vested the town of Frankenberg with many freedoms and privileges, which it still enjoys to this day, and on account of its valiant and victorious soldiers awarded a signet, upon which there formerly appeared a golden castle with a tower, together with the letter F and a golden crown."
Frankenberg, seen here from the northeast, lies on a hill above the River Eder. The hillside is covered with fields neatly separated by bushes and fences. Soaring above the town is the massive Liebfrauenkirche, which was modelled on St Elizabeth's church in Marburg.
The New Town was founded in 1335 at the foot of the hill (right) and merged with the Old Town as late as 1556. Frankenberg was founded by Conrad of Thuringia in 1233/34 to prevent the archbishops of Mainz from expanding their sphere of influence in the region.
The town quickly developed into a bustling centre of trade and commerce.

More about Braun and Hogenberg, Civitatus [+]

Reference: Van der Krogt 4, 1358; Taschen, Braun and Hogenberg, p.208.