River Tigris, the Tigris river:
A seldom mentioned constellation that was once placed near the
shoulder of Ophiuchus, the serpent-bearer. The constellation was
created by the German astronomer Jakob Bartsch during the seventeenth
century. River Tigris began at Ophiuchus then it meandered its way
between Aquila, Hercules, Cygnus, Sagitta, Equuleus, and finally
ended near Pegasus. The constellation appear on a few subsequent
star atlases, but never found wide acceptance and was quickly forgotten.
Some of the stars of River Tigris became part of another obsolete
constellation, Taurus Poniatovii, Poniatowski's bull.