Thanks to everyone who assisted finding the composer! Yes, from "Eise" to "Keiser", logigal... ;-)
So it is Reinhard Keiser's "Croesus", printed 1711! I asked also in the rec.music.early and got a link to Keiser's bio: http://www.stadt-teuchern.de/reinhard_keiser_biographie.htm How so good music is so rarely performed? What gems from that period still wait to be found? Arto To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html
