http://www.bartleby.com/65/sw/Switzerl.htmlI reviewed events in the 1200's. In 1291 there was a major battle and Switzerland won independence. Uri, Schwyz, and Unterwalden, represent the 3 mounds on the Gsell coat of arms. Also there is reference to a william tell a lengendary hero during that time, also possible allias. I think William Tell is Possible Wilhelm Gsell. He shot a apple off his son head with a crossbow and also shot Gesslar later on. This would point to the crossbow on the Gsell coat of arms, which means marksmanship.
http://www.bartleby.com/65/te/Tell-Wil.html