[2] In 983 he founded on the northern shore of the Rhine river opposite to the episcopal residence, a Benedictine abbey dedicated to Pope Gregory the Great.

In 990, Bishop Gebhard initiated a program on the episcopal estate to encourage the serfs to learn crafts, the better to support themselves.After this he called his serfs together and chose the best among them and declared that they should be cooks and millers, victuallers and fullers, cobblers and gardeners, carpenters and masters of every craft, and he decreed that, on the day on which they took care of the brethren, they should be refreshed with the bread of the brethren, for the laborer is worthy of his hire.

Gebhard is commemorated on 27 August in the archdiocese of Freiburg, and in the diocese of Rottenburg-Stuttgart on 26 November together with St. Konrad.

The relics of St. Gebhard lie at Petershausen, with the exception of an arm given by the abbey to the castle chapel in 1821.

Gebhard von Konstanz is portrayed as a bishop giving his staff to a lame man.