Hi msfonsecajr.
De Vocabulo similis notemos hoc: Aliquid dicitur similis esse alicui aut alicujus. Si, autem, dicimus aliquid non similem habere, similitudinis negatur, neque oportet dicere quem similem, quod dativus aut genitivus facerent.
I'm sorry, I'm unaccustomed to having conversation in Latin.
I'm unclear about your
neque oportet dicere quem similem, quod dativus aut genitivus facerent.
Can I understand it as
neque oportet dicere aliquem similis, quod dativus aut genitivus facerent ?
(And the translation is : nor you should say aliquem similis using accusative , which work dative or genitive would do, not accusative.)
Is this understanding ok ?
genuit puerpera regem cui nomen aeternum,
et gaudium matris habens com virginitatis honore,
nec primam similem visa est habere nec sequentem
Then, are you trying to say that one should not say
primam similem, if he means
primam as accusative of the substantive ?
But what I mean is,
1.
primam is here used as a simple adjective (not used as a substantive) attached to and modifying the substantive participle
similem (translated as
a similar person),
2.
an adjective might be used for genitive or dative of a substantive, for I know an adjective can be used for accusative of a substantive, like
vester conspectus (simply translated as
your seeing, but it can be meant as
a seeing you, in Latin sentence
conspicio vos, video vos), in which the adjective
vester (though it seems to be called possessive pronoun in grammar books) is used for accusative of the substantive
vos.
In Gildersleeve 304, note 2 it is written that possessive pronouns like
tuus,
vester can be used for objective genitive like
tui, vestri.
examples : vester conspectus (a seeing you, conspicio vos),
neglegentia tua (a neglecting you, neglegit te),
odium tuum (a hating you, odit te)
and in Glidersleeve 363 the use of objective genitive is explained, like
Amor Dei (the love toward God, amamus Deum).
And in the note to 363 it is said :
The use of the Genitive with substantives whose corresponding verbs take other cases than the Accusative, gradually increases in Latin, ..... , but it is not very common in the classical language.
3.
so, this simple adjective
prima may be here used for the genitive/dative of the substantive adjective
prima (which would refer to puerpera Maria).
Having written it, this is a little complex, I'm afraid you might not understand...