The three crosses stand in the plot Klaus since ancient times at the village entrance. You go back to the time of the Thirty Years' War and should have offered through their list of the plague stop. One calls the crosses therefore also called pest crosses". They were renewed over the centuries repeatedly, most recently in 2012.
The legend is also another development reason. So are the "three-fated siblings" Merbod, Diedo and Ilga have adopted one another and be gone from here our separate ways in the then sparsely populated Bregenzerwald.