Egophoric marking as a potentially categorical expression in language is conceived of as a binary semantic contrast that marks an event as either involving one of the speech act participants (egophoric), or as one that does not (non-egophoric). Prima facie, the egophoric marking pattern resembles person indexing and has been interpreted as such. However, it appears that what is marked does not simply correspond to indexing the speech act roles of speaker and addressee. Rather, egophoric marking appears to encode the speech participant’s respective access to events/information in terms of ‘involvement’ and is therefore more akin to epistemic categories, such as evidentiality. This thesis presents a comparative study of egophoric marking on t...