The noun 'patroness' is a gender specific noun for a female.
There is no gender specific noun for a male.
The noun patron is a common gender noun, a word for a male or a female.
patroness
The opposite gender would patroness. The opposite of a patron (supporter) could be a detractor or critic.
In ancient Rome, Juno was the patroness or protector of women. The goddess Diana was the patroness of childbirth.
St. Genevieve is the patroness of Paris.
Our Lady of the Immaculate Conception is the patroness of the United States.
A Patroness is a female ... the female equivalent of the male, Patron
The feast of Our Lady of Guadalupe, patroness of the Americas, is December 12.
Patron
If this question means Athens then it is Athena.
Athena
patroness of nature and magic
Patron /Patroness