There is a class of adverbial expressions most often telling a time of an action or the place of a movement employing the accusative case.
2.
For example, some adverbial expressions placed at the beginning of a sentence trigger inversion of pronominal subjects : " Peut-�tre est-elle partie " ( Maybe she has left ).
3.
It is relatively uncommon, and is used chiefly to mark the predicate of a nominal sentence, in fixed adverbial expressions, and in expressions relating to measurements of length, weight, and the like.
4.
If you want to emphasise just how far back that was, I suppose you could introduce an adverbial expression like " "'as much as "'150 years ago " or " "'all of "'150 years ago ".
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