The hypothesis that Old French was not a verb-second (V2) language, but rather a Topic-initial language, is evaluated in a corpus of verb initial (V1) and V2 matrix clauses extracted from a corpus of 12th- and 13th-century texts. It is shown that the initial constituent of V2 clauses is not always a Topic; it may be part of the informational Focus, or it could be an element that is neither Topic nor Focus. In addition, in V1 and V2 sentences with subject inversion, the postverbal subject may be an informational Topic, contrary to the hypothesis that subjects must move to the preverbal position to avoid being interpreted as part of the informational Focus. Therefore, from an Information-Structure point of view, Old French is similar to a standard V2 language like German. However, certain differences between 12th- and 13th-century texts could suggest that the use of the left periphery evolved during the period considered.

This article investigates the loss of aboutness topics in preverbal position in the history of French, using a corpus-based research on preverbal accusative objects. A comparison of Old and Middle French with Modern French reveals that new-information focalization had disappeared by the 14th century, whereas aboutness topicalization had in turn vanished by the end of the 16th century, along with other marked constructions. Combined with the generative premise that independent pragmatic factors should not trigger syntactic change, the results of this study suggest the reanalysis of the grammar as V-to-I in Renaissance French is responsible for blocking the derivation of aboutness topicalization. An alternative proposal based on phase extension and on Relativized Minimality, in a version affecting some types of A′-movement, relates those two diachronic shifts. The article concludes with the idea that the study of marked constructions may be recast as offering diagnostics on broader syntactic changes.