Thanks. I knew the era, and knew some documentation, just couldn't narrow
down the correct spelling and it was driving me crazy.
de gustibus non est disputandum
I believe the spelling that you're looking for is "gamurra."
This website has several pics at the top from period portraiture:
The style is
last quarter of the 15th century. If I'm reading aright, it appears to
center around Florence at this time.
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