This image at http://stepanov.lk.net/magic/milbourn/01.html is given with description ...
Joseph of Ulm included a cups and balls conjuror
in his 1404 drawing which showed the influences
of the moon. His astrological manuscript is preserved
in the Tuebingen University library in Germany.
1404 sounds "rather early" for children of planets, I would assume ... but I see, we had it already
http://www.jannesdegoochelaar.nl/media/ ... of_ulm.jpg
Ah, I see Adam McLean stating "Possibly the earliest example of this emblem form."
I find here:
http://books.google.com/books?id=e51y17 ... &q&f=false
Aus dem kalendarischen Hausbuch des Meister Joseph aus dem Kloster Güterstein bei Um, um 1475
Tübingen, Universitätsbibliok, Cod. M. d. 2
c. 1475 ... not 1404, according this statement
Planets (Mercury): [Ms Tübingen UB M d 2] German (Carthusian Monastery Güterstein, near Ulm?), ca.1475. The Children of Mercury, from an astrological manuscript. Tübingen UB Ms M.d.2, fol. 271. manuscript illumination. Includes an organ builder with positive and portative organs and a clock maker with a clock with a clapper bell. (D. Blume. Regenten des Himmels ... Berlin 200l. Taf. 40 [fine color reproduction] as ca.1475, as bound in the Carthusian Monastery of Güterstein and probably written there by an unknown Meister Joseph. Refers to it as the "Kalendarisches Hausbuch des Meister Joseph."; Hauber Planetenkinderbilder. Abb. 41, as Ulm, 1404)