Question: Who is Raghnall Mac Ruaidhrí's paternal grandfather?

Knowledge 1: Raghnall Mac Ruaidhrí
Raghnall Mac Ruaidhrí (died October 1346) was an eminent Scottish magnate and chief of Clann Ruaidhrí.Raghnall's father, Ruaidhrí Mac Ruaidhrí, appears to have been slain in 1318, at a time when Raghnall may have been under age.Ruaidhrí himself appears to have faced resistance over the Clann Ruaidhrí lordship from his sister, Cairistíona, wife of Donnchadh, a member of the comital family of Mar.Following Ruaidhrí's demise, there is evidence indicating that Cairistíona and her powerful confederates also posed a threat to the young Raghnall.Nevertheless, Raghnall eventually succeeded to his father, and first appears on record in 1337.Raghnall's possession of his family's expansive ancestral territories in the Hebrides and West Highlands put him in conflict with the neighbouring magnate William III, Earl of Ross, and contention between the two probably contributed to Raghnall's assassination at the hands of the earl's adherents in 1346.Following his death, the Clann Ruaidhrí territories passed through his sister, Áine, into the possession of her husband, the chief of Clann Domhnaill, Eóin Mac Domhnaill I, Lord of the Isles, resulting in the latter's consolidation of power in the Hebrides as Lord of the Isles. [SEP] Knowledge 2: Ruaidhrí Mac Ruaidhrí
Ruaidhrí Mac Ruaidhrí (died 14 October 1318?) was a fourteenth-century Scottish magnate and chief of Clann Ruaidhrí.He was an illegitimate son of Ailéan mac Ruaidhrí, and is recorded to have participated in the kindred's military actions against supporters of both the English Crown and Scottish Crown.Following the apparent death of his brother, Lachlann, Ruaidhrí appears to have taken control of the kindred, and firmly aligned the family with Robert I, King of Scotland.Ruaidhrí may well be the member of Clann Ruaidhrí who is recorded slain at the Battle of Faughart in support of the Bruce cause in Ireland.After his death, Ruaidhrí's half-sister, Cairistíona, attempted to transfer the Clann Ruaidhrí territories outwith the family.Ruaidhrí was survived by a daughter, Áine, and an illegitimate son, Raghnall.The latter fended off Cairistíona's actions and succeeded to the chiefship of Clann Ruaidhrí.
Knowledge 1: Raghnall Mac Ruaidhrí
Raghnall Mac Ruaidhrí (died October 1346) was an eminent Scottish magnate and chief of Clann Ruaidhrí.Raghnall's father, Ruaidhrí Mac Ruaidhrí, appears to have been slain in 1318, at a time when Raghnall may have been under age.Ruaidhrí himself appears to have faced resistance over the Clann Ruaidhrí lordship from his sister, Cairistíona, wife of Donnchadh, a member of the comital family of Mar.Following Ruaidhrí's demise, there is evidence indicating that Cairistíona and her powerful confederates also posed a threat to the young Raghnall.Nevertheless, Raghnall eventually succeeded to his father, and first appears on record in 1337.Raghnall's possession of his family's expansive ancestral territories in the Hebrides and West Highlands put him in conflict with the neighbouring magnate William III, Earl of Ross, and contention between the two probably contributed to Raghnall's assassination at the hands of the earl's adherents in 1346.Following his death, the Clann Ruaidhrí territories passed through his sister, Áine, into the possession of her husband, the chief of Clann Domhnaill, Eóin Mac Domhnaill I, Lord of the Isles, resulting in the latter's consolidation of power in the Hebrides as Lord of the Isles. [SEP] Knowledge 2: Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.He was the grandfather of singer/ poet Leonard Cohen.
Knowledge 1: Raghnall Mac Ruaidhrí
Raghnall Mac Ruaidhrí (died October 1346) was an eminent Scottish magnate and chief of Clann Ruaidhrí.Raghnall's father, Ruaidhrí Mac Ruaidhrí, appears to have been slain in 1318, at a time when Raghnall may have been under age.Ruaidhrí himself appears to have faced resistance over the Clann Ruaidhrí lordship from his sister, Cairistíona, wife of Donnchadh, a member of the comital family of Mar.Following Ruaidhrí's demise, there is evidence indicating that Cairistíona and her powerful confederates also posed a threat to the young Raghnall.Nevertheless, Raghnall eventually succeeded to his father, and first appears on record in 1337.Raghnall's possession of his family's expansive ancestral territories in the Hebrides and West Highlands put him in conflict with the neighbouring magnate William III, Earl of Ross, and contention between the two probably contributed to Raghnall's assassination at the hands of the earl's adherents in 1346.Following his death, the Clann Ruaidhrí territories passed through his sister, Áine, into the possession of her husband, the chief of Clann Domhnaill, Eóin Mac Domhnaill I, Lord of the Isles, resulting in the latter's consolidation of power in the Hebrides as Lord of the Isles. [SEP] Knowledge 2: Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.

Answer: Ailéan mac Ruaidhrí