Hans Franz Nägeli was Supreme Commander of the Bernese troops in the conquest of Vaud (1536), during the war agaist Savoy.
In the campain of March 1536 he conquered Chateau Chillon and Lausanne; the conquest of the Pays de Vaud was completed on the 29th March 1536, the day when the wonderful castle of Chillon (http://www.chillon.ch/en/castle) fell.
This figure is based on the beautiful “Schützenbrunnen” and “Vennerbrunnen”, two of the many charming sculture-fountain of Bern, made by the Master Hans Gieng in the years between 1542 and 1543. https://en.wikipedia.org/wiki/Hans_Gieng
The illustration depicts Nägeli in half-harness, with the typical broad-brimmed plumed hat.
The sculpture of the "Vennerbrunnen" in Bern