Gruffydd c1130 1151-55 1155 rebuilt old kingdom of Deheubarth Gwynedd (and sometimes Deheubarth)   Cynan ap Hywel (ruled 999 - 1005) was a Prince of Gwynedd , one of the kingdoms or principalities of medieval Wales . After the death in 999 of Maredudd ab Owain who had seized Gwynedd from