Cancianus thus comments:--

"Animadverte, quam recte charta hæc cum supra alligatis formulis
conveniat. Sponsus promiserat Morgencap, quando feminam
desponsaverat, inde vero ante conjugium chartam conscribit: et
quod et Liutprandi lege, et ex antiquis moribus _Donum_ fuit
mere gratuitum, hic appellatur _Justitia_ secundum legem
Langobardorum."

The Morgencap here assumes, I apprehend, somewhat the form of _dower_.
That it was so, is very doubtful. (Grimm, vol. ii. p. 441.
"Morgengabe.")

"An demselben Morgen empfängt die JungFrau von ihrem Gemahl ein
ansehnliches Geschenk, welches Morgengabe heisst. Schon in der
Pactio Guntherammi et Childeberti, werden Dos und Morganagiba
_unterschieden_, ebenso _Leg. Rip._ 37. 2. _Alaman_. 56. 1, 2.
Dos und Morgangeba; _Lex Burgend._ 42. 2. Morgangeba und das
'pretium nuptiale;' bei den Langobarden, 'Meta und Morgengab.'"

I do not say this answers the question of your correspondent G., which
is, what is the _derivation_ of the word?

Its actual signification, I think, means left-handed; but to think is
not to resolve, and the question is open to the charitable contributions
of your learned and able supporters.

As regards the Fairy Morgana, who was married to a mortal, I confess,
with your kind permission, I had rather not accept her as a satisfactory