Events
Date of Birth: unknown.
Date of Death: unknown.
Relationships
Father: Óláf Sihtricson (Óláfr Sigtryggsson, Amlaíb mac Sitric) (died 1034).
This relationship is shown by Bartrum (EVWG Early Series [41]) and given by Pryce (ODNB “Gruffudd ap Cynan”). The ultimate source of the information is The History of Gruffydd ap Cynan § 1. This source is often unreliable, but probably right about this relationship. (See Jones, p. 46; Baldwin, LaI). Modern scholarship seems to accept it (for example, Hudson: Viking Pirates, p. 120; ODNB article “Sihtric (d. 1042)”; Maund p. 89).
Mother: Máelcorcre ingen Dúnlaing.
This information is also given in The History of Gruffydd ap Cynan § 1. The comments on the reliability of this source above also apply here.
Spouse: Cynan ab Iago ab Idwal.
The notes for the relationship with the father also apply here.
Children:
Gruffudd married Angharard ferch Owain about 1095; married a daughter of Llychwy of Llanbeulan, Llifon; married Perwyr ferch Brân.
References
Baldwin, Stewart. Llywelyn ap Iorwerth ancestor table. (Hosted at Rootsweb.ancestry.com. Accessed 23 May 2014).
Bartrum, Peter C., “Early Series [41] “ in An Electronic Version of Welsh Genealogies AD 300-1500.
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.
16.1.2 Slani oed fam Afloyd vrenin, merch brenin Muen, dwy rann o Iwerdon.
16.1.3 <A> <Gwrymlaith> oed fam Sutrig, merch y <Vwrchoth> vrenin Llaini. Tri maib a vu y <Wrchath> vrenin, klotforaf tri or wiring oedunt <yn> Iwerdon yn eu hoes, a buanaf tri dyn: <Dwnchath> vrenin Muen; <Sutric> vrenhin Dinas Dulyn; Moelkelyn vrenin Midi.
16.2 Deu vroder oed un fam a Gruffud ap Kynan:
16.2.1 Ranallt mab <Mathawn> a oresgynnws dwy rann o Iwerdon yn oet <pythefnos> a mis; dewraf gwr ieuang oed ym rann Iwerdon. <Buanaf> march oed yr eidaw; mae y <lam> etto <yn ddihareb> yn Iwerdon, a nodeu <ymhob> tal idwal; def y kynebygit y <Bucefal>, march Alexander Mawr.
16.2.2 Y brawt arall un fam a Gruffud fab Kynan: Etwathawn brenin <Wltw>.
Hudson, Benjamin T. “Sihtric (d.1042)”, in The Oxford Dictionary of National Biography (Oxford University Press, 2004).
Hudson, Benjamin T. Viking Pirates and Christian Princes: Dynasty, Religion, and Empire in the North Atlantic. (Oxford University Press, 2005).
Jones, Arthur (ed.) The History of Gruffydd ap Cynan. (Manchester U.P., 1910).
Maund, K.L. Ireland, Wales, and England in the Eleventh Century (The Boydell Press, 1991).
Pryce, Huw. “Gruffudd ap Cynan” in The Oxford Dictionary of National Biography (Oxford University Press, 2004).