Family Group Sheet| FATHER | | Llywelyn "Llywelyn Fawr, Llywelyn the Great" ap Iorwerth (933R-4XV) | | BIRTH | 1173 | Aberffraw Castle, Gwynedd, Anglesey, Wales | | DEATH | 11 April 1240 | Aberconwy Abbey, Conwy, Conwy County, North Wales | | REF # | | 12300348; | | REF # | | | | REF # | | 60; | | MARRIAGE | 1194 | Tangwystl ferch Llywarch (LRPJ-5NH); (not married) Wales | | MARRIAGE | 23 March 1204 | Joan "Lady of Wales, Lady of Snowdon" FitzJohn (GKW2-XVH); | | MARRIAGE | 1239 | Eve FitzWarin; | | FATHER | Iorweth "Drwyndwn" Gwynedd (9ZH7-FWJ) | | MOTHER | Marared ferch Madog (9CM9-HB5) | | | | MOTHER | |
| | | CHILDREN | | 1. | Helen "the Younger, of Wales" Llywelyn (94L5-8FM) FEMALE | | | BIRTH | about 1230 | Cantref Mawr, Carmarthenshire, Wales | | BIRTH | about 1230 | | | DEATH | after 16 February 1295 | Wales | | DEATH | after 16 February 1295 | | | REF # | | 1984417; | | REF # | | | | REF # | | 60; | | REF # | | 2012123; | | MARRIAGE | | Donald Mar (LZFZ-8TN); | | MARRIAGE | | Rhys Ap Dafydd (LH5J-ZYP); | | MARRIAGE | | Malcolm Macduff (LY3C-4TX); |
| | 2. | Margaret "Margaret of Wales" ferch Llywelyn (K4BF-BN8) FEMALE | | | BIRTH | about 1208 | Caernarvonshire, Wales | | DEATH | after 1268 | Clifford Castle, Herefordshire, England | | REF # | | 12299595; | | REF # | | 13106775; | | REF # | | 60; |
| | 3. | Tegwared y Baiswen "Tegwared with the White Mantle" Llewelyn (GS5Y-LTS) MALE | | | BIRTH | about 1210 | Caernarvonshire, Wales | | REF # | | 11002940; | | REF # | | 11667580; | | REF # | | 60; |
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