Makján Aba
Makján( II) from the kindred Aba( died after 1288) was a Hungarian lord in the 13th century, who served as Palatine of Hungary from 1286 to 1287.
He was a staunch supporter of Ladislaus IV of Hungary.
Constance of Aragon
Constance of Aragon (1179 – 23 June 1222) was an Aragonese infanta who was by marriage firstly Queen of Hungary, and secondly Queen of Germany and Sicily and Holy Roman Empress.
She was regent of Sicily from 1212–1220.
She was the second child and eldest daughter of the nine children of Alfonso II of Aragon and Sancha of Castile.
John of Transylvania
John( died 1273) was a Hungarian distinguished nobleman, who served as voivode of Transylvania in 1273, during the reign of Ladislaus IV of Hungary.
Agnes of Austria (1281–1364)
Agnes of Austria( 18 May 1281 – 10 June 1364) was a Queen consort of Hungary by marriage to Andrew III of Hungary.
Charena
Charena was a nobleman in the Kingdom of Hungary, who served as Judge royal in 1184, during the reign of Béla III of Hungary.
Ladislaus III of Hungary
Ladislaus III (Slovak and ; 12007 May 1205) was King of Hungary and Croatia between 1204 and 1205.
He was the only child of King Emeric.
Ladislaus was crowned king upon the orders of his ill father, who wanted to secure his infant son's succession.
The dying king made his brother, Andrew, regent for the period of Ladislaus's minority.
However, Duke Andrew ignored the child's interests.
As a result, Ladislaus's mother, Constance of Aragon, fled to Austria, taking Ladislaus with her.
Ladislaus died unexpectedly in Vienna.
John, Archbishop of Esztergom
John( died November 1223) was a prelate in the Kingdom of Hungary in the 12th and 13th centuries.
He was Bishop of Csanád( now Cenad in Romania) between 1198 and 1201, Archbishop of Kalocsa from 1202 to 1205 and Archbishop of Esztergom between 1205 and 1223.
He crowned Ladislaus III of Hungary, Andrew II of Hungary and Coloman of Halych king.
Andrew II appointed him to govern the kingdom during his crusade between 1217 and 1218.
John of Macsó
John was a Hungarian distinguished nobleman, who served as ban of Macsó in 1273, during the reign of Ladislaus IV of Hungary.
Lodomer
Lodomer( died 2 January 1298) was a prelate in the Kingdom of Hungary in the second half of the 13th century.
He was Archbishop of Esztergom between 1279 and 1298, and Bishop of Várad( now Oradea in Romania) from 1268 till 1279.
He was an opponent of Ladislaus IV of Hungary whom he excommunicated for failing to force the Cumans to adopt the Christian way of life.
After Ladislaus' death, Lodomer and his suffragans were dedicated supporters of Andrew III of Hungary, who aimed to restore strong royal power against the rebellious lords and oligarchs.
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.

Question: Who is Ladislaus Iii Of Hungary's maternal grandfather?
Answer: Alfonso II of Aragon