PABO was the son of Arthwys ab Mar ab Ceneu ab Coel, and one of the Men of the North. He is usually called Pabo Post Prydain (Prydyn), i.e. Pabo the Pillar or Bulwark of Pictland, which implies that he was a great war " prop " to his countrymen in North Britain. In the Old-Welsh genealogies in Harleian MS. 3,859 his pedigree is given in an incorrect form, Pappo Post Priten map Ceneu map Coylhen. He was brother to Eliffer Gosgorddfawr, Ceidio, and Cynfelyn, and father of Dunawd, Cerwydd, Sawyl Benisel (also Benuchel), and Arddun Benasgell. " He was a King in the North, and was driven from his country by the Gwyddyl Ffichti (Pictish Goidels) and came to Wales, where he received lands (in Powys) from Cyngen Deyrnllwg, the son of Cadell Deyrnllwg, and his son Brochwel Ysgythrog." Topographically, however, he is entirely associated with Gwynedd. He founded the Church of Llanbabo, subject to Llanddeusant, in Anglesey, and there is a Llanbabo near Llyn Padarn, in Carnarvonshire, and near Conway, in the parish of Llangystenin, are Pabo Hamlet, Hill, and Station. He has been supposed to be " the oldest of the saints of Anglesey," where he is traditionally called " King Pabo." He is buried there at Llanbabo, where is a large sculptured slab, with his figure and the legend, in Lombardic capitals, " HIC IACET PABO POST PRVD . . ." The church is an unpretending little structure, of the fourteenth century, situated on a lonely ridge. Lewis Morris wrote,
"There is a tradition at Llanbabo that Pabo and a son and daughter of his were buried in that churchyard, over against certain faces cut in stones to be seen to this day in the south wall of that church, and against one of these faces Pabo's tombstone was by accident discovered in Charles II's time, as I was informed in 1730, or thereabouts."
It was found by the sexton, about six feet down, in digging a grave. The slab is now set upright against the south wall inside the church, by the font. The effigy is of about the middle of the fourteenth century, when the church was rebuilt. The head is crowned with a simple circlet and three fleurs-de-lis, and in the right hand is a sceptre. The sculptor who designed and executed it appears to have also sculptured S. lestyn in Llaniestyn church, in the same island. Pabo himself lived during parts of the fifth and sixth centuries, for his son Dunawd, according to the Annales Cambrics, died in 595. A tradition states, in the following lines, that he and his queen were buried at Llanerchymedd, which is not far distant from Llanbabo
Yn Llanerch'medd ym Mondo
Y claddwyd Brenin Pabo,
A'r frenhines deg ei gwedd,
Yn Llanerch'medd mae hono.
Pabo's festival is November 9, which occurs in the calendars in the lolo MSS., the Welsh Prymers of 1618 and 1633, Allwydd Paradwys (1670), and in a number of Welsh almanacs of the eighteenth century.