1158) also known as Ifor ap Meurig and in anglicised form Ivor Bach, Lord of Senghenydd, was a twelfth-century resident in and a leader of the Welsh in south Wales.
At this period the Normans had conquered England, but large areas of Wales were still under the control of the native Welsh Princes and Lords.
According to Giraldus Cambrensis in the Itinerarium Cambriae, in 1158 Ifor Bach was a tenant of William Fitz Robert, 2nd Earl of Gloucester, who held Cardiff Castle.
Descendants of Ifor ap Meurig continued to hold sway in the area and to harry the Normans for at least another century.
Ifor's descendants included his grandson Morgan Gam and his great-grandson Llywelyn Bren and, through Gruffudd and Mabel, Franklin Pierce.