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Historical linguistics has as one of its main aims, the classification of languages into language families. The internal classification of languages within a language family is known as subgrouping. Subgrouping is concerned with the way daughter languages within a single family are related to one another and therefore, with the branching structure of the family tree (Campbell 2003). In recent years, there has been a rapid increase in interest in the application of phylogenetic inference methods to diachronic language data leading to the emergence of Computational historical linguistics as a distinct field within historical linguistics. The basic intuition underlying such research is that these methods which can infer phylogeny from gene sequences can do so from language data too which also consist of sequences (Atkinson & Gray 2004).