In 1055 Gruffudd ap Llywelyn killed his rival Gruffudd ap Rhydderch in battle and recaptured Deheubarth. Gruffudd allied himself with Ælfgar, son of Leofric, Earl of Mercia, who had been deprived of his earldom of East Anglia by Harold Godwinson and his brothers. They marched on Hereford and were opposed by a force led by the Earl of Hereford, Ralph the Timid, then set Hereford on fire. This force was mounted and armed in the Norman fashion, but on 24 October 1055 Gruffudd and Ælfgar defeated it. They then sacked the city and destroyed its motte-and-bailey castle. Earl Harold was given the task of counter-attacking, but Gruffudd and Ælfgar had retreated to
South Wales whilst Harold ventured no further than Hereford. He seems here to have built a fortification at Longtown in Herefordshire before refortifying Hereford. Shortly afterwards, Ælfgar was restored to his earldom and a peace treaty concluded.
During this time, between 1053 and 1063, Wales lacked any internal strife and was at peace. The later Brut y Tywysogion described him as being "the head and shield of the Britons". John of Worcester referred to him, several decades later, as Rex Walensium, 'King of the Welsh'.
(Jones 1959) - Jones, Thomas (1959). "GRUFFUDD ap LLYWELYN (died 1063), king of Gwynedd and Powys, and after 1055 king of all Wales". Dictionary of Welsh Biography. National Library of Wales. https://biography.wales/article/arc_s-GRUF-APL-1063
Lloyd (1911). - Lloyd, John Edward (1911). A History of Wales, from the Earliest Times to the Edwardian Conquest. Vol. II (Reprint Vol. 2 of 2 ed.). Longmans, Green & Co. ISBN 978-1-334-06136-3. https://archive.org/details/historyofwalesfr01lloyuoft
(Lee, pp. 305–307) - Stephen, Leslie; Lee, Sidney, eds. (1890). "Gruffydd ab Llewelyn (d.1063)" . Dictionary of National Biography. Vol. 23. London: Smith, Elder & Co. pp. 305–307. https://en.wikisource.org/wiki/Dictionary_of_National_Biography,_1885-1900/Gruffydd_ab_Llewelyn_(d.1063)
(Lee, pp. 305–307) - Stephen, Leslie; Lee, Sidney, eds. (1890). "Gruffydd ab Llewelyn (d.1063)" . Dictionary of National Biography. Vol. 23. London: Smith, Elder & Co. pp. 305–307. https://en.wikisource.org/wiki/Dictionary_of_National_Biography,_1885-1900/Gruffydd_ab_Llewelyn_(d.1063)
(Jones 1959) - Jones, Thomas (1959). "GRUFFUDD ap LLYWELYN (died 1063), king of Gwynedd and Powys, and after 1055 king of all Wales". Dictionary of Welsh Biography. National Library of Wales. https://biography.wales/article/arc_s-GRUF-APL-1063
(Jones 1959) - Jones, Thomas (1959). "GRUFFUDD ap LLYWELYN (died 1063), king of Gwynedd and Powys, and after 1055 king of all Wales". Dictionary of Welsh Biography. National Library of Wales. https://biography.wales/article/arc_s-GRUF-APL-1063
(Lee, pp. 305–307) - Stephen, Leslie; Lee, Sidney, eds. (1890). "Gruffydd ab Llewelyn (d.1063)" . Dictionary of National Biography. Vol. 23. London: Smith, Elder & Co. pp. 305–307. https://en.wikisource.org/wiki/Dictionary_of_National_Biography,_1885-1900/Gruffydd_ab_Llewelyn_(d.1063)
(Jones 1959) - Jones, Thomas (1959). "GRUFFUDD ap LLYWELYN (died 1063), king of Gwynedd and Powys, and after 1055 king of all Wales". Dictionary of Welsh Biography. National Library of Wales. https://biography.wales/article/arc_s-GRUF-APL-1063
(Lee, pp. 305–307) - Stephen, Leslie; Lee, Sidney, eds. (1890). "Gruffydd ab Llewelyn (d.1063)" . Dictionary of National Biography. Vol. 23. London: Smith, Elder & Co. pp. 305–307. https://en.wikisource.org/wiki/Dictionary_of_National_Biography,_1885-1900/Gruffydd_ab_Llewelyn_(d.1063)
(Jones 1959) - Jones, Thomas (1959). "GRUFFUDD ap LLYWELYN (died 1063), king of Gwynedd and Powys, and after 1055 king of all Wales". Dictionary of Welsh Biography. National Library of Wales. https://biography.wales/article/arc_s-GRUF-APL-1063
(Lee, pp. 305–307) - Stephen, Leslie; Lee, Sidney, eds. (1890). "Gruffydd ab Llewelyn (d.1063)" . Dictionary of National Biography. Vol. 23. London: Smith, Elder & Co. pp. 305–307. https://en.wikisource.org/wiki/Dictionary_of_National_Biography,_1885-1900/Gruffydd_ab_Llewelyn_(d.1063)
(Jones 1959) - Jones, Thomas (1959). "GRUFFUDD ap LLYWELYN (died 1063), king of Gwynedd and Powys, and after 1055 king of all Wales". Dictionary of Welsh Biography. National Library of Wales. https://biography.wales/article/arc_s-GRUF-APL-1063
(Lee, pp. 305–307) - Stephen, Leslie; Lee, Sidney, eds. (1890). "Gruffydd ab Llewelyn (d.1063)" . Dictionary of National Biography. Vol. 23. London: Smith, Elder & Co. pp. 305–307. https://en.wikisource.org/wiki/Dictionary_of_National_Biography,_1885-1900/Gruffydd_ab_Llewelyn_(d.1063)
(Jones 1959) - Jones, Thomas (1959). "GRUFFUDD ap LLYWELYN (died 1063), king of Gwynedd and Powys, and after 1055 king of all Wales". Dictionary of Welsh Biography. National Library of Wales. https://biography.wales/article/arc_s-GRUF-APL-1063
(Lee, pp. 305–307) - Stephen, Leslie; Lee, Sidney, eds. (1890). "Gruffydd ab Llewelyn (d.1063)" . Dictionary of National Biography. Vol. 23. London: Smith, Elder & Co. pp. 305–307. https://en.wikisource.org/wiki/Dictionary_of_National_Biography,_1885-1900/Gruffydd_ab_Llewelyn_(d.1063)
(Jones 1959) - Jones, Thomas (1959). "GRUFFUDD ap LLYWELYN (died 1063), king of Gwynedd and Powys, and after 1055 king of all Wales". Dictionary of Welsh Biography. National Library of Wales. https://biography.wales/article/arc_s-GRUF-APL-1063
(Lee, pp. 305–307) - Stephen, Leslie; Lee, Sidney, eds. (1890). "Gruffydd ab Llewelyn (d.1063)" . Dictionary of National Biography. Vol. 23. London: Smith, Elder & Co. pp. 305–307. https://en.wikisource.org/wiki/Dictionary_of_National_Biography,_1885-1900/Gruffydd_ab_Llewelyn_(d.1063)
(Jones 1959) - Jones, Thomas (1959). "GRUFFUDD ap LLYWELYN (died 1063), king of Gwynedd and Powys, and after 1055 king of all Wales". Dictionary of Welsh Biography. National Library of Wales. https://biography.wales/article/arc_s-GRUF-APL-1063
(Jones 1959) - Jones, Thomas (1959). "GRUFFUDD ap LLYWELYN (died 1063), king of Gwynedd and Powys, and after 1055 king of all Wales". Dictionary of Welsh Biography. National Library of Wales. https://biography.wales/article/arc_s-GRUF-APL-1063
(Lee, pp. 305–307) - Stephen, Leslie; Lee, Sidney, eds. (1890). "Gruffydd ab Llewelyn (d.1063)" . Dictionary of National Biography. Vol. 23. London: Smith, Elder & Co. pp. 305–307. https://en.wikisource.org/wiki/Dictionary_of_National_Biography,_1885-1900/Gruffydd_ab_Llewelyn_(d.1063)
(Lee, pp. 305–307) - Stephen, Leslie; Lee, Sidney, eds. (1890). "Gruffydd ab Llewelyn (d.1063)" . Dictionary of National Biography. Vol. 23. London: Smith, Elder & Co. pp. 305–307. https://en.wikisource.org/wiki/Dictionary_of_National_Biography,_1885-1900/Gruffydd_ab_Llewelyn_(d.1063)
(Davies 1993, p. 100) - Davies, John (1993). A History of Wales. London: Penguin. p. 100. ISBN 0-14-014581-8.
(Maund 1991, pp. 64–67) - Maund, K. L. (1991). Ireland, Wales, and England in the Eleventh Century. Boydell & Brewer Ltd. ISBN 978-0-85115-533-3. https://searchworks.stanford.edu/view/727664
(Maund 1991, pp. 64–67) - Maund, K. L. (1991). Ireland, Wales, and England in the Eleventh Century. Boydell & Brewer Ltd. ISBN 978-0-85115-533-3. https://searchworks.stanford.edu/view/727664
(Maund 1991, pp. 64–67) - Maund, K. L. (1991). Ireland, Wales, and England in the Eleventh Century. Boydell & Brewer Ltd. ISBN 978-0-85115-533-3. https://searchworks.stanford.edu/view/727664
(Jones 1959) - Jones, Thomas (1959). "GRUFFUDD ap LLYWELYN (died 1063), king of Gwynedd and Powys, and after 1055 king of all Wales". Dictionary of Welsh Biography. National Library of Wales. https://biography.wales/article/arc_s-GRUF-APL-1063
(Lee, pp. 305–307) - Stephen, Leslie; Lee, Sidney, eds. (1890). "Gruffydd ab Llewelyn (d.1063)" . Dictionary of National Biography. Vol. 23. London: Smith, Elder & Co. pp. 305–307. https://en.wikisource.org/wiki/Dictionary_of_National_Biography,_1885-1900/Gruffydd_ab_Llewelyn_(d.1063)
(Lee, pp. 305–307) - Stephen, Leslie; Lee, Sidney, eds. (1890). "Gruffydd ab Llewelyn (d.1063)" . Dictionary of National Biography. Vol. 23. London: Smith, Elder & Co. pp. 305–307. https://en.wikisource.org/wiki/Dictionary_of_National_Biography,_1885-1900/Gruffydd_ab_Llewelyn_(d.1063)
(Davies 1993, p. 100) - Davies, John (1993). A History of Wales. London: Penguin. p. 100. ISBN 0-14-014581-8.
Compare Remfry, P. M.; Annales Cambriae, 68 and notes /wiki/Annales_Cambriae
(Maund 1991, pp. 64–67) - Maund, K. L. (1991). Ireland, Wales, and England in the Eleventh Century. Boydell & Brewer Ltd. ISBN 978-0-85115-533-3. https://searchworks.stanford.edu/view/727664
(Jones 1959) - Jones, Thomas (1959). "GRUFFUDD ap LLYWELYN (died 1063), king of Gwynedd and Powys, and after 1055 king of all Wales". Dictionary of Welsh Biography. National Library of Wales. https://biography.wales/article/arc_s-GRUF-APL-1063
(Maund 1991, pp. 64–67) - Maund, K. L. (1991). Ireland, Wales, and England in the Eleventh Century. Boydell & Brewer Ltd. ISBN 978-0-85115-533-3. https://searchworks.stanford.edu/view/727664
(Jones 1959) - Jones, Thomas (1959). "GRUFFUDD ap LLYWELYN (died 1063), king of Gwynedd and Powys, and after 1055 king of all Wales". Dictionary of Welsh Biography. National Library of Wales. https://biography.wales/article/arc_s-GRUF-APL-1063
(Lee, pp. 305–307) - Stephen, Leslie; Lee, Sidney, eds. (1890). "Gruffydd ab Llewelyn (d.1063)" . Dictionary of National Biography. Vol. 23. London: Smith, Elder & Co. pp. 305–307. https://en.wikisource.org/wiki/Dictionary_of_National_Biography,_1885-1900/Gruffydd_ab_Llewelyn_(d.1063)
(Maund 1991, pp. 64–67) - Maund, K. L. (1991). Ireland, Wales, and England in the Eleventh Century. Boydell & Brewer Ltd. ISBN 978-0-85115-533-3. https://searchworks.stanford.edu/view/727664