My PhD was on eleventh century Wales and its political networks, internal and external. I've also worked on two mediaeval chronicles (oen Irish, one Welsh), studying how they were written, analysing their sources, biases and structure and their relationships to other surviving texts. Other things I've worked on include the poltical and social structures of 9th century Denmark, the kinship networks of early mediaeval Wales, feuds, the letters and charters of the Welsh princes c. 1100-1300, the history and position of women in early Wales and the relationships of the Anglo-Saxon kingdom of Mercia to its Welsh neighbours.