It is known to Japanese learners that the Japanese verb isn't affected by the
subject (number or gender). Today, a linguistics professor of my university
told me he heard from his teacher that ancient Japanese had some kind of
plural declension.

I tried to search on google and on this site but couldn't find any
information. So I'm asking if you know something about it.
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2012-12-19T19:11:57.423
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2013-02-02T03:15:36.530
2012-12-20T12:58:24.570
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question
grammar verbs history plurals
Plural in ancient Japanese?
(This is my comment with small changes in wording.)

Japanese have some suffixes for nouns which signify plurality such as たち, ら,
and ども, and this might be referred to as “some kind of plural declension,”
although showing plurality is not required grammatically like English.

If your professor was talking about conjugating a verb according to the number
of its subject in Japanese in some old period, I would say that that sounds
like a groundless claim. As far as I know, there is no evidence that Japanese
had the conjugation like that. (But I am not a linguist.)
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2012-12-22T18:36:48.387
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2012-12-22T18:36:48.387
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answer
Notice that he said "declension", i.e., a _noun_ suffix etc. Probably -ra and
-tachi were much more productive in Old Japanese, and what little I know of
older Japanese it seems to be the case.
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2013-02-02T03:15:36.530
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answer