Here he joined on 31 October 1650 the 'Sodality of the Unmarried Men of Age' (Sodaliteit der bejaerde jongmans), a fraternity for bachelors established by the Jesuit order.
[9][10] He also continued to paint Italianate landscapes with many figures and antique ruins serving an international clientele including German aristocrats.
[6] Goubau is best known as a painter of market scenes placed in a Roman or Mediterranean setting, often decorated with many small figures in the style of the Bamboccianti.
The name Bamboccianti is given to a loose group of principally Dutch and Flemish genre painters who were active in Rome from about 1625 until the end of the seventeenth century.
Guardroom scenes often included mercenaries and prostitutes dividing booty, harassing captives, or indulging in other forms of reprehensible activities.
[11] A good example of the genre is the Guardroom painting at the Kurpfälzisches Museum in Heidelberg, which depicts eight soldiers around a table in a monumental room.
The card players are crouching on the floor, while a provocatively dressed woman is playing a lute and a soldier with his back turned towards the viewer is raising his glass to a man who is smoking.
The painting also references the theme of vanitas through the still life of a standard and military equipment at the front on the right, which expresses the transience of power and fame.