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.
