The history of Gwynedd in the High Middle Ages is a period in the History of Wales spanning the 11th through the 13th centuries. Gwynedd, located in the north of Wales, eventually became the most dominant of Welsh principalities during this period. Distinctive achievements in Gwynedd include further development of Medieval Welsh literature, particularly poets known as the Beirdd y Tywysogion (Welsh for Poets of the Princes) associated with the court of Gwynedd; the reformation of bardic schools; and the continued development of Cyfraith Hywel (The Law of Hywel, or Welsh law). All three of these further contributed to the development of a Welsh national identity in the face of Anglo-Norman encroachment of Wales.