On the 30th May 1726, as part of his third Leipzig annual cycle of cantatas, Bach directed the first performance of his Ascension Cantata "Gott fähret auf mit Jauchzen". The libretto was published at Rudolstadt during the same year without any indication of the autor's name, in a collection entitled "Sonn- und Fest-Tags-Andachten über die ordenlichen Evangelia". The libretti in that collection had already been used during the Church year 1704/05 at the Court of Meiningen; their author may have b...