Events
Date of Birth: unknown.
Date of Death: unknown.
Relationships
Father: Dúnlaing mac Tuathail (died 1014).
This relationship is given in The History of Gruffydd ap Cynan § 1. This source is often unreliable, but is probably accurate about this relationship (Baldwin LaI). It is given by Thornton (Figure 3 "Maternal Ancestry of Gruffudd ap Cynan emended from independent sources").
Mother: unknown.
Spouse: Óláf Sihtricson (died 1034).
This relationship is given in The History of Gruffydd ap Cynan § 1. This source is often unreliable, but is probably accurate about this relationship (Baldwin LaI). It is given by Thornton.
Children:
Radnaillt (Ragnhildr) married Cynan ab Iago.
References
Baldwin, Stewart. Llywelyn ap Iorwerth ancestor table. (Hosted at Rootsweb.ancestry.com. Accessed 23 May 2014).
Guy, Ben. Medieval Welsh Genealogy. (The Boydell Press, 2020).
From Guy’s critical edition of the Llywelyn ab Iorwerth genealogies, which were based on an archetype created no later than the first half of the fourteenth century from an original compilation dating to the early thirteenth century, partly based on earlier written sources (Note that Guy is striving for textual rather than genealogical accuracy):
16. Mam Gruffud ap Kynan:
16.1 Ranillt ferch Alfoid m. Sutrig m. <Glinvarn> m. Sutrig m. Harallt Harfagyr m. Siwyrder Sur m. Beor m. Siwyrder Ris m. Harallt Harfagyr. Yr Harallt hwnnw a oresgynnws Lychlyn oll, ag diolyes y holl vrenined ohonei, ag a vu ehun oruchel vrenin dros Lychlyn. Harallt <Harffagyr> ap Haldan Du ap <Gwythrid> Vrenin Helgwr ap Haldan Milde ap Eisten ap Haldan Chinbein, y brenin kyntaf a doeth y Lychlyn o Suesia. Ranallt m <Gwrthryd> ap Afloyd m. Gwrthryt Mearch m. Harallt Du m. Ifor Gamle m. Afloyd m. <Sutric>.
16.1.1 <Mam> Ranillt, nain Gruffud ap Kynan: Maelgreg ferch Dwling m. Dwthil vrenin Lani, y bymet ran o Iwerdon.
Jones, Arthur (ed.) The History of Gruffydd ap Cynan. (Manchester U.P., 1910).
Thornton, David E. “The genealogy of Gruffudd ap Cynan” in Gruffudd ap Cynan (1996).