pronouns - Can intensifiers intensify nouns?

So from what I've gathered intensifiers intensify either adjectives (modifiers) or adverbs (or adverbial phrases) but can they intensify nouns? eg.

"A long time ago your heroic grandfathers helped build the city council"

In this declarative sentence if 'heroic' is an intensifier, then isn't it intensifying the noun? As there is a personal pronoun 'your' before heroic and grandfathers. Or is it just not an intensifier completely?