17th-century portrait painting of men, with Anonymous, Unspecified, Unidentified or Unknown artist, and missing location and year.
Source: P. de Vallière: Treue und Ehre. Geschichte der Schweizer in Fremden Diensten. Deutsch von Walter Sandoz. Lausanne o. J. [1940]. License: CC-PD-Mark PD-Art (PD-old-100)