Dative subjects and the rise of positional licensing in Icelandic.

We present the results of research on two areas of Icelandic historical syntax: dative subjects and V1 word order. These strands of syntax had previously been examined independently, but were found to be intimately connected as part of a broader collaboration between theoretical and computational linguistics involving the Icelandic Parsed Historical Corpus (IcePaHC). The interaction we found between V1 declaratives and dative subjects provides evidence for: a) changes over time with respect to the association of dative arguments with the subject role (contra Barðdal and Eythórsson 2009); b) the gradual development of left peripheral structure and the rise of positional licensing (in line with Kiparsky 1995, 1997). We provide an analysis of posi- tional licensing in LFG terms and account for the newly observed complex interaction between datives, subjects and word order presented in this paper.