In 2015, we celebrate the centennial of the decipherment of Hittite by Bedrich Hrozný and, thus, the establishment of Hittite linguistics. The outstanding contributions of Hrozný to the fields of Hittitology and Comparative Philology were acknowledged, among other things, within the framework of the conference of the Society of Indo-European Studies, which took place in Marburg on September 21?23, 2015. The location was especially appropriate for the occasion because of the focus on the Anatolian branch of the Indo-European languages, which characterizes Comparative Philology at Marburg. 0The title?100th Anniversary of the Decipherment of Hittite: Morpho-syntactic Categories in Language History and Research? combined assessing past achievements with an enquiry into research questions that are relevant for current scholarship. Special focus was placed on the impact of Hittite evidence on the reconstruction of the Indo-European proto-language and its phylogeny.